Hi All,

A long time ago I posted about an issue where calls on one of our Asterisk 
boxes were being dropped in Voicemail (and 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 
[email protected] - no reply to our critical 
packet (see doc/sip-retransmit.txt).".

I thought the issue had cleared itself up, but it has resurfaced. We're running 
1.4.22 on built from source, using Cisco 7961G phones with the SIP firmware 
image (and I've tried most of the recent firmware versions for the Cisco phones 
to see if that would change things at all).

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


<--- Reliably Transmitting (no NAT) to 10.2.0.203:5060 --->
SIP/2.0 407 Proxy Authentication Required
Via: SIP/2.0/UDP 10.2.0.203:5060;branch=z9hG4bK1971acea;received=10.2.0.203
From: "Jim Felderman" <sip:[email protected]>;tag=001d45b61d4906943a6bb290-9435a462
To: <sip:[email protected]>;tag=as00aa5042
Call-ID: [email protected]
CSeq: 101 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Proxy-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="1db91b00"
Content-Length: 0


<------------>
Scheduling destruction of SIP dialog 
'[email protected]' in 32000 ms (Method: INVITE)
Sending to 10.2.0.203 : 5060 (no NAT)
Using INVITE request as basis request - 
[email protected]
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 10.2.0.203:29422
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 10.2.0.203:29422
Looking for Voicemail in internal (domain 10.2.0.2)
list_route: hop: <sip:[email protected]: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=z9hG4bKddc0a0b8;received=10.2.0.203
From: "Jim Felderman" <sip:[email protected]>;tag=001d45b61d4906943a6bb290-9435a462
To: <sip:[email protected]>
Call-ID: [email protected]
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:[email protected]>
Content-Length: 0


<------------>
Audio is at 10.2.0.2 port 12088
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=z9hG4bKddc0a0b8;received=10.2.0.203
From: "Jim Felderman" <sip:[email protected]>;tag=001d45b61d4906943a6bb290-9435a462
To: <sip:[email protected]>;tag=as58c8eec4
Call-ID: [email protected]
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:[email protected]>
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 12088 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 14:33:01] NOTICE[15644]: sched.c:220 ast_sched_add_variable: Scheduled 
event in 0 ms?
Sending to 10.2.0.203 : 5060 (no NAT)
cworks-phones1*CLI>
<--- 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=z9hG4bK8a220b9f;received=10.2.0.203
From: "Jim Felderman" <sip:[email protected]>;tag=001d45b61d4906943a6bb290-9435a462
To: <sip:[email protected]>;tag=as58c8eec4
Call-ID: [email protected]
CSeq: 103 BYE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:[email protected]>
Content-Length: 0


<------------>
Really destroying SIP dialog '[email protected]' 
Method: BYE
Sending to 10.2.0.203 : 5060 (no NAT)
cworks-phones1*CLI>
<--- Reliably Transmitting (no NAT) to 10.2.0.203:5060 --->
SIP/2.0 407 Proxy Authentication Required
Via: SIP/2.0/UDP 10.2.0.203:5060;branch=z9hG4bK51921801;received=10.2.0.203
From: "Jim Felderman" <sip:[email protected]>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:[email protected]>;tag=as537c53ce
Call-ID: [email protected]
CSeq: 101 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Proxy-Authenticate: Digest algorithm=MD5, realm="asterisk", nonce="20c9330e"
Content-Length: 0


<------------>
Scheduling destruction of SIP dialog 
'[email protected]' in 32000 ms (Method: INVITE)
Sending to 10.2.0.203 : 5060 (no NAT)
Using INVITE request as basis request - 
[email protected]
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:[email protected]: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:[email protected]>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:[email protected]>
Call-ID: [email protected]
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:[email protected]>
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:[email protected]>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:[email protected]>;tag=as53449c29
Call-ID: [email protected]
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:[email protected]>
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:[email protected]>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:[email protected]>;tag=as53449c29
Call-ID: [email protected]
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:[email protected]>
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:[email protected]>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:[email protected]>;tag=as53449c29
Call-ID: [email protected]
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:[email protected]>
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:[email protected]>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:[email protected]>;tag=as53449c29
Call-ID: [email protected]
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:[email protected]>
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 
'[email protected]' in 32000 ms (Method: NOTIFY)
Reliably Transmitting (no NAT) to 10.2.0.203:5060:
NOTIFY sip:[email protected]:5060;transport=udp SIP/2.0
Via: SIP/2.0/UDP 10.2.0.2:5060;branch=z9hG4bK59292f64;rport
From: "asterisk" <sip:[email protected]>;tag=as73ca9f87
To: <sip:[email protected]:5060;transport=udp>
Contact: <sip:[email protected]>
Call-ID: [email protected]
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:[email protected]
Voice-Message: 3/5

---
Really destroying SIP dialog '[email protected]' 
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:[email protected]>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:[email protected]>;tag=as53449c29
Call-ID: [email protected]
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:[email protected]>
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:[email protected]>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:[email protected]>;tag=as53449c29
Call-ID: [email protected]
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:[email protected]>
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:[email protected]>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:[email protected]>;tag=as53449c29
Call-ID: [email protected]
CSeq: 102 INVITE
User-Agent: Asterisk PBX
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces
Contact: <sip:[email protected]>
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 [email protected] 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 
[email protected] - no reply to our critical 
packet (see doc/sip-retransmit.txt).
Really destroying SIP dialog '[email protected]' 
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:[email protected]>;tag=001d45b61d4906959ea33ab4-af2b7b8b
To: <sip:[email protected]>;tag=as53449c29
Call-ID: [email protected]
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 
'[email protected]' in 32000 ms (Method: NOTIFY)
Reliably Transmitting (no NAT) to 10.2.0.203:5060:
NOTIFY sip:[email protected]:5060;transport=udp SIP/2.0
Via: SIP/2.0/UDP 10.2.0.2:5060;branch=z9hG4bK0cb71f67;rport
From: "asterisk" <sip:[email protected]>;tag=as0b88d5a9
To: <sip:[email protected]:5060;transport=udp>
Contact: <sip:[email protected]>
Call-ID: [email protected]
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:[email protected]
Voice-Message: 2/6

---
Really destroying SIP dialog '[email protected]' 
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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