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res_pjsip_refer/session: Calls dropped during transfer

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When doing an attended transfer it's possible for the transferer, after
receiving an accepted response from Asterisk, to send a BYE to Asterisk,
which can then be processed before Asterisk has time to start and/or
complete the transfer process. This of course causes the transfer to not
complete successfully, thus dropping the call.

This patch makes it so any BYEs received from the transferer, after the REFER,
that initiate a session end are deferred until the transfer is complete. This
allows the channel that would have otherwise been hung up by Asterisk to
remain available throughout the transfer process.

ASTERISK-27053 #close

Change-Id: I43586db79079457d92d71f1fd993be9a3b409d5a
This commit is contained in:
Kevin Harwell
2017-06-13 14:17:29 -05:00
parent abe1dd3039
commit 9e53c30610
4 changed files with 46 additions and 0 deletions
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8
res/res_pjsip_refer.c
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@@ -543,6 +543,7 @@ static int refer_attended_task(void *data)
}
}
ast_sip_session_end_if_deferred(attended->transferer);
if (response != 200) {
if (!ast_sip_push_task(attended->transferer->serializer,
defer_termination_cancel, attended->transferer)) {
@@ -772,6 +773,7 @@ static int refer_incoming_attended_request(struct ast_sip_session *session, pjsi
/* Push it to the other session, which will have both channels with minimal locking */
if (ast_sip_push_task(other_session->serializer, refer_attended_task, attended)) {
ast_sip_session_end_if_deferred(session);
ast_sip_session_defer_termination_cancel(session);
ao2_cleanup(attended);
return 500;
@@ -810,9 +812,12 @@ static int refer_incoming_attended_request(struct ast_sip_session *session, pjsi
response = xfer_response_code2sip(ast_bridge_transfer_blind(1, session->channel,
"external_replaces", context, refer_blind_callback, &refer));
ast_sip_session_end_if_deferred(session);
if (response != 200) {
ast_sip_session_defer_termination_cancel(session);
}
return response;
}
}
@@ -865,9 +870,12 @@ static int refer_incoming_blind_request(struct ast_sip_session *session, pjsip_r
response = xfer_response_code2sip(ast_bridge_transfer_blind(1, session->channel,
exten, context, refer_blind_callback, &refer));
ast_sip_session_end_if_deferred(session);
if (response != 200) {
ast_sip_session_defer_termination_cancel(session);
}
return response;
}