Hi All, 

I posted this a couple weeks ago with no response, I'm hoping that someone will 
see it this time around and be so kind as to offer advice for resolving this 
issue (or point me in the direction of a better place to ask) 

"Some" (but not all) calls on one of our Asterisk boxes are being dropped in 
Voicemail -- only in voicemail -- after about 20 seconds with the error logged 
"[Jan 19 14:33:26] WARNING[27458]: chan_sip.c:1980 retrans_pkt: Hanging up call 
001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203 - no reply to our critical 
packet (see doc/sip-retransmit.txt).". 

We're running Asterisk 1.4.22 built from source and Cisco 7961G phones with the 
SIP firmware image. I've tried most of the recent firmware versions for the 
phones with no real impact on the issue. Strange thing is that while all of the 
phones use a variation on the same config file (with the only changes being the 
SIP account details and speed dial keys) but one user in particular seems to 
suffer the issue far more frequently. 

I would appreciate any assistance since I'm stumped. The output of SIP DEBUG 
for the extension most frequently affected by the issue is below; starting with 
one call to voicemail that was successfully completed, followed by a 2nd call 
that was dropped after approximately 18 seconds. 

The issue is consistently inconsistent - it doesn't happen on every call to 
Voicemail, but those that it does happen on it's always within the first 
approximately 20 seconds of the call; once you pass the 25 second mark you're 
free and clear for that call-it will not be dropped. It also seems like it's 
possible to reproduce the issue by making several calls to Voicemail in short 
order, but this isn't the only trigger as sometimes the first call to voicemail 
in 12+ hours will also trigger it. 

I'm also baffled by the fact that this ONLY crops up on calls to Voicemail on 
the local box; SIP to SIP calls on the same Asterisk box, SIP to SIP calls from 
this Asterisk box to an Asterisk Appliance at a remote site, SIP to POTS, and 
POTS to SIP calls are completely unaffected. 

Again, any advice/suggestions/things to look at/etc are greatly appreciated! 

Thanks in advance, 

Lincoln

<------------>
Scheduling destruction of SIP dialog 
'001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203' in 32000 ms (Method: INVITE) 
Sending to 10.2.0.203 : 5060 (no NAT) Using INVITE request as basis request - 
001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203
Found RTP audio format 0
Found RTP audio format 8
Found RTP audio format 18
Found RTP audio format 101
Peer audio RTP is at port 10.2.0.203:24394 Found audio description format PCMU 
for ID 0 Found audio description format PCMA for ID 8 Found audio description 
format G729 for ID 18 Found audio description format telephone-event for ID 101
Capabilities: us - 0x8000e (gsm|ulaw|alaw|h263), peer - audio=0x10c 
(ulaw|alaw|g729)/video=0x0 (nothing), combined - 0xc (ulaw|alaw) Non-codec 
capabilities (dtmf): us - 0x1 (telephone-event), peer - 0x1 (telephone-event), 
combined - 0x1 (telephone-event) Peer audio RTP is at port 10.2.0.203:24394 
Looking for Voicemail in internal (domain 10.2.0.2)
list_route: hop: <sip:1...@10.2.0.203:5060;transport=udp>
cworks-phones1*CLI>
<--- Transmitting (no NAT) to 10.2.0.203:5060 ---> SIP/2.0 100 Trying
Via: SIP/2.0/UDP 10.2.0.203:5060;branch=z9hG4bK2343a87a;received=10.2.0.203
From: "Jim Felderman" <sip:1...@10.2.0.2>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:voicem...@10.2.0.2>
Call-ID: 001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:voicem...@10.2.0.2>
Content-Length: 0


<------------>
Audio is at 10.2.0.2 port 13256
Adding codec 0x4 (ulaw) to SDP
Adding codec 0x8 (alaw) to SDP
Adding non-codec 0x1 (telephone-event) to SDP

<--- Reliably Transmitting (no NAT) to 10.2.0.203:5060 ---> SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.2.0.203:5060;branch=z9hG4bK2343a87a;received=10.2.0.203
From: "Jim Felderman" <sip:1...@10.2.0.2>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:voicem...@10.2.0.2>;tag=as53449c29
Call-ID: 001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:voicem...@10.2.0.2>
Content-Type: application/sdp
Content-Length: 256

v=0
o=root 27452 27452 IN IP4 10.2.0.2
s=session
c=IN IP4 10.2.0.2
t=0 0
m=audio 13256 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=sendrecv

<------------>
Retransmitting #1 (no NAT) to 10.2.0.203:5060:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.2.0.203:5060;branch=z9hG4bK2343a87a;received=10.2.0.203
From: "Jim Felderman" <sip:1...@10.2.0.2>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:voicem...@10.2.0.2>;tag=as53449c29
Call-ID: 001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:voicem...@10.2.0.2>
Content-Type: application/sdp
Content-Length: 256

v=0
o=root 27452 27452 IN IP4 10.2.0.2
s=session
c=IN IP4 10.2.0.2
t=0 0
m=audio 13256 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=sendrecv

---
Retransmitting #2 (no NAT) to 10.2.0.203:5060:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.2.0.203:5060;branch=z9hG4bK2343a87a;received=10.2.0.203
From: "Jim Felderman" <sip:1...@10.2.0.2>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:voicem...@10.2.0.2>;tag=as53449c29
Call-ID: 001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:voicem...@10.2.0.2>
Content-Type: application/sdp
Content-Length: 256

v=0
o=root 27452 27452 IN IP4 10.2.0.2
s=session
c=IN IP4 10.2.0.2
t=0 0
m=audio 13256 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=sendrecv

---
Retransmitting #3 (no NAT) to 10.2.0.203:5060:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.2.0.203:5060;branch=z9hG4bK2343a87a;received=10.2.0.203
From: "Jim Felderman" <sip:1...@10.2.0.2>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:voicem...@10.2.0.2>;tag=as53449c29
Call-ID: 001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:voicem...@10.2.0.2>
Content-Type: application/sdp
Content-Length: 256

v=0
o=root 27452 27452 IN IP4 10.2.0.2
s=session
c=IN IP4 10.2.0.2
t=0 0
m=audio 13256 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=sendrecv

---
Scheduling destruction of SIP dialog 
'44b7d5c43fff7c0567e6c3be3d7d6...@10.2.0.2' in 32000 ms (Method: NOTIFY) 
Reliably Transmitting (no NAT) to 10.2.0.203:5060:
NOTIFY sip:1...@10.2.0.203:5060;transport=udp SIP/2.0
Via: SIP/2.0/UDP 10.2.0.2:5060;branch=z9hG4bK59292f64;rport
From: "asterisk" <sip:aster...@10.2.0.2>;tag=as73ca9f87
To: <sip:1...@10.2.0.203:5060;transport=udp>
Contact: <sip:aster...@10.2.0.2>
Call-ID: 44b7d5c43fff7c0567e6c3be3d7d6...@10.2.0.2
CSeq: 102 NOTIFY
User-Agent: Asterisk PBX
Max-Forwards: 70
Event: message-summary
Content-Type: application/simple-message-summary
Content-Length: 83

Messages-Waiting: yes
Message-Account: sip:aster...@10.2.0.2
Voice-Message: 3/5

---
Really destroying SIP dialog '44b7d5c43fff7c0567e6c3be3d7d6...@10.2.0.2' 
Method: NOTIFY Retransmitting #4 (no NAT) to 10.2.0.203:5060:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.2.0.203:5060;branch=z9hG4bK2343a87a;received=10.2.0.203
From: "Jim Felderman" <sip:1...@10.2.0.2>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:voicem...@10.2.0.2>;tag=as53449c29
Call-ID: 001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:voicem...@10.2.0.2>
Content-Type: application/sdp
Content-Length: 256

v=0
o=root 27452 27452 IN IP4 10.2.0.2
s=session
c=IN IP4 10.2.0.2
t=0 0
m=audio 13256 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=sendrecv

---
Retransmitting #5 (no NAT) to 10.2.0.203:5060:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.2.0.203:5060;branch=z9hG4bK2343a87a;received=10.2.0.203
From: "Jim Felderman" <sip:1...@10.2.0.2>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:voicem...@10.2.0.2>;tag=as53449c29
Call-ID: 001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:voicem...@10.2.0.2>
Content-Type: application/sdp
Content-Length: 256

v=0
o=root 27452 27452 IN IP4 10.2.0.2
s=session
c=IN IP4 10.2.0.2
t=0 0
m=audio 13256 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=sendrecv

---
Retransmitting #6 (no NAT) to 10.2.0.203:5060:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.2.0.203:5060;branch=z9hG4bK2343a87a;received=10.2.0.203
From: "Jim Felderman" <sip:1...@10.2.0.2>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:voicem...@10.2.0.2>;tag=as53449c29
Call-ID: 001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:voicem...@10.2.0.2>
Content-Type: application/sdp
Content-Length: 256

v=0
o=root 27452 27452 IN IP4 10.2.0.2
s=session
c=IN IP4 10.2.0.2
t=0 0
m=audio 13256 RTP/AVP 0 8 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=sendrecv

---
[Jan 19 14:33:26] WARNING[27458]: chan_sip.c:1958 retrans_pkt: Maximum retries 
exceeded on transmission 001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203 for 
seqno 102 (Critical Response) -- See doc/sip-retransmit.txt.
[Jan 19 14:33:26] WARNING[27458]: chan_sip.c:1980 retrans_pkt: Hanging up call 
001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203 - no reply to our critical 
packet (see doc/sip-retransmit.txt).
Really destroying SIP dialog '001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203' 
Method: INVITE Sending to 10.2.0.203 : 5060 (no NAT) cworks-phones1*CLI>
<--- Transmitting (no NAT) to 10.2.0.203:5060 ---> SIP/2.0 481 Call 
leg/transaction does not exist
Via: SIP/2.0/UDP 10.2.0.203:5060;branch=z9hG4bK446b7de3;received=10.2.0.203
From: "Jim Felderman" <sip:1...@10.2.0.2>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:voicem...@10.2.0.2>;tag=as53449c29
Call-ID: 001d45b6-1d490088-46ef7ed6-adbeb...@10.2.0.203
CSeq: 103 BYE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Content-Length: 0


<------------>
Scheduling destruction of SIP dialog 
'0d32ee8515d9f6dc4439002f1d601...@10.2.0.2' in 32000 ms (Method: NOTIFY) 
Reliably Transmitting (no NAT) to 10.2.0.203:5060:
NOTIFY sip:1...@10.2.0.203:5060;transport=udp SIP/2.0
Via: SIP/2.0/UDP 10.2.0.2:5060;branch=z9hG4bK0cb71f67;rport
From: "asterisk" <sip:aster...@10.2.0.2>;tag=as0b88d5a9
To: <sip:1...@10.2.0.203:5060;transport=udp>
Contact: <sip:aster...@10.2.0.2>
Call-ID: 0d32ee8515d9f6dc4439002f1d601...@10.2.0.2
CSeq: 102 NOTIFY
User-Agent: Asterisk PBX
Max-Forwards: 70
Event: message-summary
Content-Type: application/simple-message-summary
Content-Length: 83

Messages-Waiting: yes
Message-Account: sip:aster...@10.2.0.2
Voice-Message: 2/6

---
Really destroying SIP dialog '0d32ee8515d9f6dc4439002f1d601...@10.2.0.2' 
Method: NOTIFY cworks-phones1*CLI>


--
Lincoln King-Cliby, CTS
Applications Engineer
ControlWorks Consulting, LLC
V: 440-729-4640 x1107 F: 440-729-0884 I: http://www.thecontrolworks.com/ 
Crestron Authorized Independent Programmer




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