[Ericsson AB]

megaco

MODULE

megaco

MODULE SUMMARY

Main API of the Megaco application

DESCRIPTION

Interface module for the Megaco application

EXPORTS

start() -> ok | {error, Reason}

Types:

Reason = term()

Starts the Megaco application

Users may either explicitly be registered with megaco:start_user/2 and/or be statically configured by setting the application environment variable 'users' to a list of {UserMid, Config} tuples. See the function megaco:start_user/2 for details.

stop() -> ok | {error, Reason}
stop

Types:

Reason = term()

Stops the Megaco application

start_user(UserMid, Config) -> ok | {error, Reason}

Types:

UserMid = megaco_mid()
Config = [{user_info_item(), user_info_value()}]
Reason = term()

Initial configuration of a user

Requires the megaco application to be started. A user is either a Media Gateway (MG) or a Media Gateway Controller (MGC). One Erlang node may host many users.

A user is identified by its UserMid, which must be a legal Megaco MID.

Config is a list of {Item, Value} tuples. See megaco:user_info/2 about which items and values that are valid.

stop_user(UserMid) -> ok | {error, Reason}

Types:

UserMid = megaco_mid()
Reason = term()

Delete the configuration of a user

Requires that the user does not have any active connection.

user_info(UserMid, Item) -> Value | exit(Reason)

Types:

Handle = user_info_handle()
UserMid = megaco_mid()
Item = user_info_item()
Value = user_info_value()
Reason = term()

Lookup user information

The following Item's are valid:

connections
Lists all active connections for this user. Returns a list of megaco_conn_handle records.
receive_handle
Construct a megaco_receive_handle record from user config
min_trans_id
First trans id. A positive integer, defaults to 1.
max_trans_id
Last trans id. A positive integer or infinity, defaults to infinity.
request_timer
Wait for reply. A Timer (see explanation below, defaults to #megaco_incr_timer{}).
long_request_timer
Wait for reply after pending. A Timer (see explanation below, defaults to infinity).
auto_ack
Automatic send transaction ack when the transaction reply has been received (see trans_ack below).
This is used for three-way-handshake.
A boolean, defaults to false.
trans_ack
Shall ack's be accumulated or not.
This property is only valid if auto_ack is true.
If auto_ack is true, then if trans_ack is false, ack's will be sent immediatelly. If trans_ack is true, then ack's will instead be sent to the transaction sender process for accumulation and later sending (see trans_ack_maxcount, trans_req_maxcount, trans_req_maxsize, trans_ack_maxcount and trans_timer).
See also transaction sender for more info.
An boolean, defaults to false.
trans_ack_maxcount
Maximum number of accumulated ack's. At most this many ack's will be accumulated by the transaction sender (if started and configured to accumulate ack's).
See also transaction sender for more info.
An integer, defaults to 10.
trans_req
Shall requests be accumulated or not.
If trans_req is false, then request(s) will be sent immediatelly (in it's own message).
If trans_req is true, then request(s) will instead be sent to the transaction sender process for accumulation and later sending (see trans_ack_maxcount, trans_req_maxcount, trans_req_maxsize, trans_ack_maxcount and trans_timer).
See also transaction sender for more info.
An boolean, defaults to false.
trans_req_maxcount
Maximum number of accumulated requests. At most this many requests will be accumulated by the transaction sender (if started and configured to accumulate requests).
See also transaction sender for more info.
An integer, defaults to 10.
trans_req_maxsize
Maximum size of the accumulated requests. At most this much requests will be accumulated by the transaction sender (if started and configured to accumulate requests).
See also transaction sender for more info.
An integer, defaults to 2048.
trans_timer
Transaction sender timeout time. Has two functions. First, if the value is 0, then transactions will not be accumulated (e.g. the transaction sender process will not be started). Second, if the value is greater then 0 and auto_ack and trans_ack is true or if trans_req is true, then transaction sender will be started and transactions (which is depending on the values of auto_ack, trans_ack and trans_req) will be accumulated, for later sending.
See also transaction sender for more info.
An integer, defaults to 0.
pending_timer
Automatic send pending if the timer expires before a transaction reply has been sent. This timer is also called provisional response timer. A Timer (see explanation below, defaults to 30000).
sent_pending_limit
Sent pending limit (see the MGOriginatedPendingLimit and the MGCOriginatedPendingLimit of the megaco root package). This parameter specifies how many pending messages that can be sent (for a given received transaction request). When the limit is exceeded, the transaction is aborted (see handle_trans_request_abort) and an error message is sent to the other side.
Note that this has no effect on the actual sending of pending transactions. This is either implicit (e.g. when receiving a re-sent transaction request for a request which is beeing processed) or controlled by the pending_timer, see above.
A positive integer or infinity.
Defaults to infinity.
recv_pending_limit
Receive pending limit (see the MGOriginatedPendingLimit and the MGCOriginatedPendingLimit of the megaco root package). This parameter specifies how many pending messages that can be received (for a sent transaction request). When the limit is exceeded, the transaction is considered lost, and an error returned to the user (through the call-back function handle_trans_reply).
A positive integer or infinity.
Defaults to infinity.
reply_timer
Wait for an ack. A Timer (see explanation below, defaults to 30000).
send_mod
Send callback module which exports send_message/2. The function SendMod:send_message(SendHandle, Binary) is invoked when the bytes needs to be transmitted to the remote user. An atom, defaults to megaco_tcp.
encoding_mod
Encoding callback module which exports encode_message/2 and decode_message/2. The function EncodingMod:encode_message(EncodingConfig, MegacoMessage) is invoked whenever a 'MegacoMessage' record needs to be translated into an Erlang binary. The function EncodingMod:decode_message(EncodingConfig, Binary) is invoked whenever an Erlang binary needs to be translated into a 'MegacoMessage' record. An atom, defaults to megaco_pretty_text_encoder.
encoding_config
Encoding module config. A list, defaults to [].
protocol_version
Actual protocol version. Default is 1.
reply_data
Default reply data. Any term, defaults to the atom undefined.
user_mod
Name of the user callback module. See the the reference manual for megaco_user for more info.
user_args
List of extra arguments to the user callback functions. See the the reference manual for megaco_user for more info.
threaded
If a received message contains several transaction requests, this option indicates whether the requests should be handled sequencially in the same process (false), or if each request should be handled by it's own process (true i.e. a separate process is spawned for each request).
Defaults to false.

A Timer may be:

infinity
Means that the timer never will time out
Integer
Waits the given number of milli seconds before it times out.
IncrTimer
A megaco_incr_timer record. Waits a given number of milli seconds, recalculates a new timer by multiplying a static factor and adding a static increment and starts all over again after retransmitting the message again. A maximum number of repetition can be stated.

update_user_info(UserMid, Item, Value) -> ok | {error, Reason}

Types:

UserMid = megaco_mid()
Item = user_info_item()
Value = user_info_value()
Reason = term()

Update information about a user

Requires that the user is started. See megaco:user_info/2 about which items and values that are valid.

conn_info(ConnHandle, Item) -> Value | exit(Reason)

Types:

ConnHandle = #megaco_conn_handle{}
Item = conn_info_item()
Value = conn_info_value()
Reason = term()

Lookup information about an active connection

Requires that the connection is active.

control_pid
The process identifier of the controlling process for a conenction.
send_handle
Opaque send handle whose contents is internal for the send module. May be any term.
receive_handle
Construct a megaco_receive_handle record.
trans_id
Next trans id. A positive integer.
max_trans_id
Last trans id. A positive integer or infinity, defaults to infinity.
request_timer
Wait for reply. A Timer (see explanation below, defaults to #megaco_incr_timer{}.
long_request_timer
Wait for reply after pending. A Timer (see explanation below, defaults to infinity.
auto_ack
Automatic send transaction ack when the transaction reply has been received (see trans_ack below).
This is used for three-way-handshake.
A boolean, defaults to false.
trans_ack
Shall ack's be accumulated or not.
This property is only valid if auto_ack is true.
If auto_ack is true, then if trans_ack is false, ack's will be sent immediatelly. If trans_ack is true, then ack's will instead be sent to the transaction sender process for accumulation and later sending (see trans_ack_maxcount, trans_req_maxcount, trans_req_maxsize, trans_ack_maxcount and trans_timer).
See also transaction sender for more info.
An boolean, defaults to false.
trans_ack_maxcount
Maximum number of accumulated ack's. At most this many ack's will be accumulated by the transaction sender (if started and configured to accumulate ack's).
See also transaction sender for more info.
An integer, defaults to 10.
trans_req
Shall requests be accumulated or not.
If trans_req is false, then request(s) will be sent immediatelly (in it's own message).
If trans_req is true, then request(s) will instead be sent to the transaction sender process for accumulation and later sending (see trans_ack_maxcount, trans_req_maxcount, trans_req_maxsize, trans_ack_maxcount and trans_timer).
See also transaction sender for more info.
An boolean, defaults to false.
trans_req_maxcount
Maximum number of accumulated requests. At most this many requests will be accumulated by the transaction sender (if started and configured to accumulate requests).
See also transaction sender for more info.
An integer, defaults to 10.
trans_req_maxsize
Maximum size of the accumulated requests. At most this much requests will be accumulated by the transaction sender (if started and configured to accumulate requests).
See also transaction sender for more info.
An integer, defaults to 2048.
trans_timer
Transaction sender timeout time. Has two functions. First, if the value is 0, then transactions will not be accumulated (e.g. the transaction sender process will not be started). Second, if the value is greater then 0 and auto_ack and trans_ack is true or if trans_req is true, then transaction sender will be started and transactions (which is depending on the values of auto_ack, trans_ack and trans_req) will be accumulated, for later sending.
See also transaction sender for more info.
An integer, defaults to 0.
pending_timer
Automatic send transaction pending if the timer expires before a transaction reply has been sent. This timer is also called provisional response timer. A Timer (see explanation below, defaults to 30000.
sent_pending_limit
Sent pending limit (see the MGOriginatedPendingLimit and the MGCOriginatedPendingLimit of the megaco root package). This parameter specifies how many pending messages that can be sent (for a given received transaction request). When the limit is exceeded, the transaction is aborted (see handle_trans_request_abort) and an error message is sent to the other side.
Note that this has no effect on the actual sending of pending transactions. This is either implicit (e.g. when receiving a re-sent transaction request for a request which is beeing processed) or controlled by the pending_timer, see above.
A positive integer or infinity.
Defaults to infinity.
recv_pending_limit
Receive pending limit (see the MGOriginatedPendingLimit and the MGCOriginatedPendingLimit of the megaco root package). This parameter specifies how many pending messages that can be received (for a sent transaction request). When the limit is exceeded, the transaction is considered lost, and an error returned to the user (through the call-back function handle_trans_reply).
A positive integer or infinity.
Defaults to infinity.
reply_timer
Wait for an ack. A Timer (see explanation below, defaults to 30000.
send_mod
Send callback module which exports send_message/2. The function SendMod:send_message(SendHandle, Binary) is invoked when the bytes needs to be transmitted to the remote user. An atom, defaults to megaco_tcp.
encoding_mod
Encoding callback module which exports encode_message/2 and decode_message/2. The function EncodingMod:encode_message(EncodingConfig, MegacoMessage) is invoked whenever a 'MegacoMessage' record needs to be translated into an Erlang binary. The function EncodingMod:decode_message(EncodingConfig, Binary) is invoked whenever an Erlang binary needs to be translated into a 'MegacoMessage' record. An atom, defaults to megaco_pretty_text_encoder.
encoding_config
Encoding module config. A list, defaults to [].
protocol_version
Actual protocol version. Current default is 1.
reply_data
Default reply data. Any term, defaults to the atom undefined.
threaded
If a received message contains several transaction requests, this option indicates whether the requests should be handled sequencially in the same process (false), or if each request should be handled by it's own process (true i.e. a separate process is spawned for each request).
Defaults to false.

A Timer may be:

infinity
Means that the timer never will time out
Integer
Waits the given number of milli seconds before it times out.
IncrTimer
A megaco_incr_timer record. Waits a given number of milli seconds, recalculates a new timer by multiplying a static factor and adding a static increment and starts all over again after retransmitting the message again. A maximum number of repetition can be stated.

update_conn_info(ConnHandle, Item, Value) -> ok | {error, Reason}

Types:

ConnHandle = #megaco_conn_handle{}
Item = conn_info_item()
Value = conn_info_value()
Reason = term()

Update information about an active connection

Requires that the connection is activated. See megaco:conn_info/2 about which items and values that are valid.

system_info(Item) -> Value | exit(Reason)

Types:

Item = system_info_item()

Lookup system information

The following items are valid:

text_config
The text encoding config.
connections
Lists all active connections. Returns a list of megaco_conn_handle records.
users
Lists all active users. Returns a list of megaco_mid()'s.
n_active_requests
Returns an integer representing the number of requests that has originated from this Erlang node and still are active (and therefore consumes system resources).
n_active_replies
Returns an integer representing the number of replies that has originated from this Erlang node and still are active (and therefore consumes system resources).
n_active_connections
Returns an integer representing the number of active connections.

connect(ReceiveHandle, RemoteMid, SendHandle, ControlPid) -> {ok, ConnHandle} | {error, Reason}

Types:

ReceiveHandle = #megaco_receive_handle{}
RemoteMid = preliminary_mid | megaco_mid()
SendHandle = term()
ControlPid = pid()
ConnHandle = #megaco_conn_handle{}
Reason = term()

Establish a "virtual" connection

Activates a connection to a remote user. When this is done the connection can be used to send messages (with SendMod:send_message/2). The ControlPid is the identifier of a process that controls the connection. That process will be supervised and if it dies, this will be detected and the UserMod:handle_disconnect/2 callback function will be invoked. See the megaco_user module for more info about the callback arguments. The connection may also explicitly be deactivated by invoking megaco:disconnect/2.

The ControlPid may be the identity of a process residing on another Erlang node. This is useful when you want to distribute a user over several Erlang nodes. In such a case one of the nodes has the physical connection. When a user residing on one of the other nodes needs to send a request (with megaco:call/3 or megaco:cast/3), the message will encoded on the originating Erlang node, and then be forwarded to the node with the physical connection. When the reply arrives, it will be forwarded back to the originator. The distributed connection may explicitely be deactivated by a local call to megaco:disconnect/2 or implicitely when the physical connection is deactivated (with megaco:disconnect/2, killing the controlling process, halting the other node, ...).

The call of this function will trigger the callback function UserMod:handle_connect/2 to be invoked. See the megaco_user module for more info about the callback arguments.

A connection may be established in several ways:

provisioned MID
The MG may explicitely invoke megaco:connect/4 and use a provisioned MID of the MGC as the RemoteMid.
upgrade preliminary MID
The MG may explicitely invoke megaco:connect/4 with the atom 'preliminary_mid' as a temporary MID of the MGC, send an intial message, the Service Change Request, to the MGC and then wait for an initial message, the Service Change Reply. When the reply arrives, the Megaco application will pick the MID of the MGC from the message header and automatically upgrade the connection to be a "normal" connection. By using this method of establishing the connection, the callback function UserMod:handle_connect/2 to be invoked twice. First with a ConnHandle with the remote_mid-field set to preliminary_mid, and then when the connection upgrade is done with the remote_mid-field set to the actual MID of the MGC.
automatic
When the MGC receives its first message, the Service Change Request, the Megaco application will automatically establish the connection by using the MG MID found in the message header as remote mid.
distributed
When a user (MG/MGC) is distributed over several nodes, it is required that the node hosting the connection already has activated the connection and that it is in the "normal" state. The RemoteMid must be a real Megaco MID and not a preliminary_mid.

An initial megaco_receive_handle record may be obtained with megaco:user_info(UserMid, receive_handle)

The send handle is provided by the preferred transport module, e.g. megaco_tcp, megaco_udp. Read the documentation about each transport module about the details.

disconnect(ConnHandle, DiscoReason) -> ok | {error, ErrReason}

Types:

ConnHandle = conn_handle()
DiscoReason = term()
ErrReason = term()

Tear down a "virtual" connection

Causes the UserMod:handle_disconnect/2 callback function to be invoked. See the megaco_user module for more info about the callback arguments.

call(ConnHandle, Actions, Options) -> {ProtocolVersion, UserReply}

Types:

ConnHandle = conn_handle()
Actions = action_reqs() | [action_reqs()]
action_reqs() = binary() | [#'ActionRequest'{}]
Options = [send_option()]
send_option() = {request_timer, timer()} | {long_request_timer, timer()} | {send_handle, term()} | {protocol_version, integer()}
UserReply = user_reply() | [user_reply()]
user_reply() = success() | failure()
success() = {ok, [#'ActionReply'{}]}
failure() = message_error() | other_error()
message_error() = {error, error_descr()}
other_error() = {error, term()}

Sends one or more transaction request(s) and waits for the reply.

When sending one transaction in a message, Actions should be action_reqs() (UserReply will then be user_reply()). When sending several transactions in a message, Actions should be [action_reqs()] (UserReply will then be [user_reply()]). Each element of the list is part of one transaction.

It is also possible to pre-encode the actions, in which case Actions will be either a binary() or [binary()].

The function returns when the reply arrives, when the request timer eventually times out or when the outstanding requests are explicitly cancelled.

The default values of the send options are obtained by megaco:conn_info(ConnHandle, Item). But the send options above, may explicitly be overridden.

The ProtocolVersion version is the version actually encoded in the reply message.

At success(), the UserReply contains a list of 'ActionReply' records possibly containing error indications.

A message_error(), indicates that the remote user has replied with an explicit transactionError.

An other_error(), indicates some other error such as timeout or {user_cancel, ReasonForCancel}.

cast(ConnHandle, Actions, Options) -> ok | {error, Reason}

Types:

ConnHandle = conn_handle()
Actions = action_reqs() | [action_reqs()]
action_reqs() = binary() | [#'ActionRequest'{}]
Options = [send_option()]
send_option() = {request_timer, timer()} | {long_request_timer, timer()} | {send_handle, term()} | {reply_data, reply_data()} | {protocol_version, integer()}
Reason = term()

Sends one or more transaction request(s) but does NOT wait for a reply

When sending one transaction in a message, Action should be action_reqs(). When sending several transactions in a message, Actions should be [action_reqs()]. Each element of the list is part of one transaction.

It is also possible to pre-encode the actions, in which case Actions will be either a binary() or [binary()].

The default values of the send options are obtained by megaco:conn_info(ConnHandle, Item). But the send options above, may explicitly be overridden.

The ProtocolVersion version is the version actually encoded in the reply message.

The callback function UserMod:handle_trans_reply/4 is invoked when the reply arrives, when the request timer eventually times out or when the outstanding requests are explicitly cancelled. See the megaco_user module for more info about the callback arguments.

Given as UserData argument to UserMod:handle_trans_reply/4.

encode_actions(ConnHandle, Actions, Options) -> {ok, BinOrBins} | {error, Reason}

Types:

ConnHandle = conn_handle()
Actions = action_reqs() | [action_reqs()]
action_reqs() = [#'ActionRequest'{}]
Options = [send_option()]
send_option() = {request_timer, timer()} | {long_request_timer, timer()} | {send_handle, term()} | {protocol_version, integer()}
BinOrBins = binary() | [binary()]
Reason = term()

Encodes lists of action requests for one or more transaction request(s).

When encoding action requests for one transaction, Actions should be action_reqs(). When encoding action requests for several transactions, Actions should be [action_reqs()]. Each element of the list is part of one transaction.

cancel(ConnHandle, CancelReason) -> ok | {error, ErrReason}

Types:

ConnHandle = conn_handle()
CancelReason = term()
ErrReason = term()

Cancel all outstanding messages for this connection

This causes outstanding megaco:call/3 requests to return. The callback functions UserMod:handle_reply/4 and UserMod:handle_trans_ack/4 are also invoked where it applies. See the megaco_user module for more info about the callback arguments.

process_received_message(ReceiveHandle, ControlPid, SendHandle, BinMsg) -> ok

Types:

ReceiveHandle = #megaco_receive_handle{}
ControlPid = pid()
SendHandle = term()
BinMsg = binary()

Process a received message

This function is intended to be invoked by some transport modules when get an incoming message. Which transport that actually is used is up to the user to choose.

The message is delivered as an Erlang binary and is decoded by the encoding module stated in the receive handle together with its encoding config (also in the receive handle). Depending of the outcome of the decoding various callback functions will be invoked. See megaco_user for more info about the callback arguments.

Note that all processing is done in the context of the calling process. A transport module could call this function via one of the spawn functions (e.g. spawn_opt). See also receive_message/4.

If the message cannot be decoded the following callback function will be invoked:

If the decoded message instead of transactions contains a message error, the following callback function will be invoked:

If the decoded message happens to be received before the connection is established, a new "virtual" connection is established. This is typically the case for the Media Gateway Controller (MGC) upon the first Service Change. When this occurs the following callback function will be invoked:

For each transaction request in the decoded message the following callback function will be invoked:

For each transaction reply in the decoded message the reply is returned to the user. Either the originating function megaco:call/3 will return. Or in case the originating function was megaco:case/3 the following callback function will be invoked:

When a transaction acknowledgement is received it is possible that user has decided not to bother about the acknowledgement. But in case the return value from UserMod:handle_trans_request/3 indicates that the acknowledgement is important the following callback function will be invoked:

See the megaco_user module for more info about the callback arguments.

receive_message(ReceiveHandle, ControlPid, SendHandle, BinMsg) -> ok

Types:

ReceiveHandle = #megaco_receive_handle{}
ControlPid = pid()
SendHandle = term()
BinMsg = binary()

Process a received message

This is a callback function intended to be invoked by some transport modules when get an incoming message. Which transport that actually is used is up to the user to choose.

In principle, this function calls the process_received_message/4 function via a spawn to perform the actual processing.

For further information see the process_received_message/4 function.

parse_digit_map(DigitMapBody) -> {ok, ParsedDigitMap} | {error, Reason}

Types:

DigitMapBody = string()
ParsedDigitMap = parsed_digit_map()
parsed_digit_map() = term()
Reason = term()

Parses a digit map body

Parses a digit map body, represented as a list of characters, into a list of state transitions suited to be evaluated by megaco:eval_digit_map/1,2.

eval_digit_map(DigitMap) -> {ok, Letters} | {error, Reason}
eval_digit_map(DigitMap, Timers) -> {ok, Letters} | {error, Reason}

Types:

DigitMap = #'DigitMapValue'{} | parsed_digit_map()
parsed_digit_map() = term()
ParsedDigitMap = term()
Timers = ignore() | reject()
ignore() = ignore | {ignore, digit_map_value()}
reject() = reject | {reject, digit_map_value()} | digit_map_value()
Letters = [letter()]
letter() = $0..$9 | $a .. $k
Reason = term()

Collect digit map letters according to the digit map

When evaluating a digit map, a state machine waits for timeouts and letters reported by megaco:report_digit_event/2. The length of the various timeouts are defined in the digit_map_value() record.

When a complete sequence of valid events has been received, the result is returned as a list of letters.

There are two options for handling syntax errors (that is when an unexpected event is received when the digit map evaluator is expecting some other event). The unexpected events may either be ignored or rejected. The latter means that the evaluation is aborted and an error is returned.

report_digit_event(DigitMapEvalPid, Events) -> ok | {error, Reason}

Types:

DigitMapEvalPid = pid()
Events = Event | [Event]
Event = letter() | pause() | cancel()
letter() = $0..$9 | $a .. $k | $A .. $K
pause() = one_second() | ten_seconds()
one_second() = $s | $S
ten_seconds() = $l | $L
cancel () = $z | $Z | cancel
Reason = term()

Send one or more events to the event collector process

Send one or more events to a process that is evaluating a digit map, that is a process that is executing megaco:eval_digit_map/1,2

test_digit_event(DigitMap, Events) -> {ok, Letters} | {error, Reason}

Types:

DigitMap = #'DigitMapValue'{} | parsed_digit_map()
parsed_digit_map() = term()
ParsedDigitMap = term()
Timers = ignore() | reject()
ignore() = ignore | {ignore, digit_map_value()}
reject() = reject | {reject, digit_map_value()} | digit_map_value()
DigitMapEvalPid = pid()
Events = Event | [Event]
Event = letter() | pause() | cancel()
letter() = $0..$9 | $a .. $k | $A .. $K
pause() = one_second() | ten_seconds()
one_second() = $s | $S
ten_seconds() = $l | $L
cancel () = $z | $Z | cancel
Reason = term()

Feed digit map collector with events and return the result

This function starts the evaluation of a digit map with megaco:eval_digit_map/1 and sends a sequence of events to it megaco:report_digit_event/2 in order to simplify testing of digit maps.

test_request(ConnHandle, Version, EncodingMod, EncodingConfig, Actions) -> {MegaMsg, EncodeRes}

Types:

ConnHandle = conn_handle()
Version = integer()
EncodingMod = atom()
EncodingConfig = Encoding configuration
Actions = A list
MegaMsg = #'MegacoMessage'{}
EncodeRes = {ok, Bin} | {error, Reason}
Bin = binary()
Reason = term()

Tests if the Actions argument is correctly composed.

This function is only intended for testing purposes. It's supposed to have a same kind of interface as the call or cast functions (with the additions of the EncodingMod and EncodingConfig arguments). It composes a complete megaco message end attempts to encode it. The return value, will be a tuple of the composed megaco message and the encode result.

test_reply(ConnHandle, Version, EncodingMod, EncodingConfig, Reply) -> {MegaMsg, EncodeRes}

Types:

ConnHandle = conn_handle()
Version = integer()
EncodingMod = atom()
EncodingConfig = A list
Reply = actual_reply()
MegaMsg = #'MegacoMessage'{}
EncodeRes = {ok, Bin} | {error, Reason}
Bin = binary()
Reason = term()

Tests if the Reply argument is correctly composed.

This function is only intended for testing purposes. It's supposed to test the actual_reply() return value of the callback functions handle_trans_request and handle_trans_long_request functions (with the additions of the EncodingMod and EncodingConfig arguments). It composes a complete megaco message end attempts to encode it. The return value, will be a tuple of the composed megaco message and the encode result.

versions1() -> {ok, Info} | {error, Reason}
versions2() -> {ok, Info} | {error, Reason}

Types:

Info = [info()]
info() = term()
Reason = term()

Utility functions used to retreive some system and application info.

The difference between the two functions is in how they get the modules to check. versions1 uses the app-file and versions2 uses the function application:get_key.

enable_trace(Level, Destination) -> void()

Types:

Level = max | min | 0 <= integer() <= 100
Destination = File | Port | HandlerSpec | io
File = string()
Port = integer()
HandleSpec = {HandlerFun, Data}
HandleFun = fun() (two arguments)
Data = term()

This function is used to start megaco tracing at a given Level and direct result to the given Destination.

It starts a tracer server and then sets the proper match spec (according to Level).

In the case when Destination is File, the printable megaco trace events will be printed to the file File using plain io:format/2.

In the case when Destination is io, the printable megaco trace events will be printed on stdout using plain io:format/2.

See dbg for further information.

disable_trace() -> void()

This function is used to stop megaco tracing.

set_trace(Level) -> void()

Types:

Level = max | min | 0 <= integer() <= 100

This function is used to change the megaco trace level.

It is assumed that tracing has already been enabled (see enable_trace above).

get_stats() -> {ok, TotalStats} | {error, Reason}
get_stats(GlobalCounter) -> {ok, CounterStats} | {error, Reason}
get_stats(CallHandle) -> {ok, CallHandleStats} | {error, Reason}
get_stats(CallHandle, Counter) -> {ok, integer()} | {error, Reason}

Types:

TotalStats = [total_stats()]
total_stats() = {call_handle(), [stats()]} | {global_counter(), integer()}
GlobalCounter = global_counter()
GlobalCounterStats = integer()
CallHandle = call_handle()
CallHandleStats = [stats()]
stats() = {counter(), integer()}
Counter = counter()
counter() = medGwyGatewayNumTimerRecovery | medGwyGatewayNumErrors
global_counter() = medGwyGatewayNumErrors
Reason = term()

Retreive the (SNMP) statistic counters. The global counters handle events that cannot be attributed to a single connection (e.g. protocol errors that occur before the connection has been properly setup).

reset_stats() -> void()
reset_stats(SendHandle) -> void()

Types:

SendHandle = send_handle()

Reset all related (SNMP) statistics counters.

AUTHORS

Håkan Mattsson - support@erlang.ericsson.se

megaco 3.0.1
Copyright © 1991-2005 Ericsson AB