[Asterisk-Users] IAX2->SIP dropped calls

[Adam Moffett]

Apparently we've been having calls sporadically drop.  We're using an 
IAX outbound trunk and SIP adapters on the inside.

Below is a log excerpt detailing one of the calls which dropped, and it 
looks largely normal to me except for this:

Jan  5 13:31:07 DEBUG[3776] channel.c: Didn't get a frame from channel: 
IAX2/teliax-2
Jan  5 13:31:07 DEBUG[3776] channel.c: Bridge stops bridging channels 
IAX2/teliax-2 and SIP/davidblanco-e02c

Can missing one IAX frame result in a dropped call?  Seems pretty 
fragile if that's the case.  Would enabling the jitter buffer mitigate 
this?  Any other suggestions?









Jan  5 13:29:51 VERBOSE[29852] logger.c:     -- Accepting 
UNAUTHENTICATED call from 208.139.204.245:
       > requested format = ulaw,
       > requested prefs = (g729|ulaw|g726|gsm),
       > actual format = gsm,
       > host prefs = (gsm|ulaw),
       > priority = mine
Jan  5 13:29:51 VERBOSE[3776] logger.c:     -- Executing 
Dial("IAX2/teliax-2", "SIP/davidblanco|30|tr") in new stack
Jan  5 13:29:51 DEBUG[3776] chan_sip.c: Setting NAT on RTP to 524288
Jan  5 13:29:51 DEBUG[3776] chan_sip.c: Outgoing Call for davidblanco
Jan  5 13:29:51 VERBOSE[3776] logger.c:     -- Called davidblanco
Jan  5 13:29:51 DEBUG[29854] chan_sip.c: (Provisional) Stopping 
retransmission (but retaining packet) on 
'58b5f3b5793b56376fc4a0bf180a8500 at 168.215.99.50' Request 102: Found
Jan  5 13:29:51 DEBUG[29854] chan_sip.c: (Provisional) Stopping 
retransmission (but retaining packet) on 
'58b5f3b5793b56376fc4a0bf180a8500 at 168.215.99.50' Request 102: Found
Jan  5 13:29:51 VERBOSE[3776] logger.c:     -- SIP/davidblanco-e02c is 
ringing
Jan  5 13:29:57 DEBUG[29854] chan_sip.c: Acked pending invite 102
Jan  5 13:29:57 DEBUG[29854] chan_sip.c: build_route: Contact hop: 
<sip:davidblanco at 192.168.1.50:5060>
Jan  5 13:29:57 VERBOSE[3776] logger.c:     -- SIP/davidblanco-e02c 
answered IAX2/teliax-2
Jan  5 13:29:57 DEBUG[29852] chan_iax2.c: Ooh, voice format changed to 2
Jan  5 13:29:59 DEBUG[29852] chan_iax2.c: Peer lastms 70, historicms 70, 
maxms 2000
Jan  5 13:30:15 DEBUG[29852] chan_iax2.c: Peer lastms 28, historicms 28, 
maxms 2000
Jan  5 13:30:59 DEBUG[29852] chan_iax2.c: Peer lastms 71, historicms 71, 
maxms 2000
Jan  5 13:31:07 DEBUG[29852] chan_iax2.c: Immediately destroying 2, 
having received hangup
Jan  5 13:31:07 DEBUG[3776] channel.c: Didn't get a frame from channel: 
IAX2/teliax-2
Jan  5 13:31:07 DEBUG[3776] channel.c: Bridge stops bridging channels 
IAX2/teliax-2 and SIP/davidblanco-e02c
Jan  5 13:31:07 DEBUG[3776] chan_sip.c: update_call_counter(davidblanco) 
- decrement call limit counter
Jan  5 13:31:07 DEBUG[3776] app_dial.c: Exiting with DIALSTATUS=ANSWER.
Jan  5 13:31:07 VERBOSE[3776] logger.c:   == Spawn extension (default, 
6078210976, 1) exited non-zero on 'IAX2/teliax-2'
Jan  5 13:31:07 DEBUG[3776] cdr_addon_mysql.c: cdr_mysql: inserting a 
CDR record.
***CDR STUFF OMITTED***
Jan  5 13:31:07 DEBUG[3776] chan_iax2.c: We're hanging up IAX2/teliax-2 
now...
Jan  5 13:31:07 DEBUG[3776] chan_iax2.c: Really destroying IAX2/teliax-2 
now...
Jan  5 13:31:07 VERBOSE[3776] logger.c:     -- Hungup 'IAX2/teliax-2'