I am having issues with transfers (SIP/REFER) using Asterisk 1.6. You will
find the SIP debug below.
There are three phones in this setup. 5253 and 5258 are Aastra 53i telephones,
101 is a standard phone connected through an Audiocodes gateway. All phones
are registered in context "phones" and are set to not allow reinvites. All
phones can dial each other directly. The dialplan looks as follows:
[phones]
Exten => 5253,1,Dial(SIP/5253,10)
Exten => 5878,1,Dial(SIP/5878,10)
Exten => 101,1,Dial(SIP/[EMAIL PROTECTED],10)
Transfer fails regardless of the order (101 calls 5878, 5878 transfers to 5253
or 5878 calls 5253, 5253 transfers to 101, etc)
I do not understand the message "Spawn Extension (phones, 101, 0) exited
non-zero" in the debug - there is no "priority zero" in a dialplan - priority
should start at 1. What is this message telling me?
What do I need to do to allow these phones to transfer calls between each
other? Any help is greatly appreciated!
Here is the debug:
*CLI> == Using SIP RTP CoS mark 5
== Using UDPTL CoS mark 5
-- Executing [EMAIL PROTECTED]:1] Dial("SIP/5253-0823eab0", "SIP/5878") in
new stack
== Using SIP RTP CoS mark 5
== Using UDPTL CoS mark 5
Audio is at 10.7.10.1 port 19968
Adding codec 0x4 (ulaw) to SDP
Adding non-codec 0x1 (telephone-event) to SDP
Reliably Transmitting (NAT) to 10.7.10.51:5060:
INVITE sip:[EMAIL PROTECTED]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.7.10.1:5060;branch=z9hG4bK38d90448;rport
Max-Forwards: 70
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>
Contact: <sip:[EMAIL PROTECTED]:5060>
Call-ID: [EMAIL PROTECTED]
CSeq: 102 INVITE
User-Agent: Asterisk PBX 1.6.0-beta2
Remote-Party-ID: "5253" <sip:[EMAIL PROTECTED]>;privacy=off;screen=no
Date: Wed, 30 Jan 2008 01:12:41 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces, timer
Content-Type: application/sdp
Content-Length: 259
v=0
o=root 864806723 864806723 IN IP4 10.7.10.1
s=Asterisk PBX 1.6.0-beta2
c=IN IP4 10.7.10.1
t=0 0
m=audio 19968 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=sendrecv
---
-- Called 5878
<--- SIP read from UDP://10.7.10.51:5060 --->
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP
10.7.10.1:5060;branch=z9hG4bK38d90448;rport=5060;received=10.7.10.1
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Call-ID: [EMAIL PROTECTED]
CSeq: 102 INVITE
Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, OPTIONS, UPDATE, PRACK,
SUBSCRIBE, INFO
Allow-Events: talk, hold, conference
Call-Info: <sip:10.7.10.1>;appearance-index=1
Contact: 5878 <sip:[EMAIL PROTECTED]:5060>
Server: Aastra 53i/2.1.0.2145
Content-Length: 0
<------------->
--- (12 headers 0 lines) ---
-- SIP/5878-08250098 is ringing
<--- SIP read from UDP://10.7.10.51:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP
10.7.10.1:5060;branch=z9hG4bK38d90448;rport=5060;received=10.7.10.1
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Call-ID: [EMAIL PROTECTED]
CSeq: 102 INVITE
Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, OPTIONS, UPDATE, PRACK,
SUBSCRIBE, INFO
Allow-Events: talk, hold, conference
Call-Info: <sip:10.7.10.1>;appearance-index=1
Contact: 5878 <sip:[EMAIL PROTECTED]:5060>
Server: Aastra 53i/2.1.0.2145
Supported: timer, replaces
Content-Type: application/sdp
Content-Length: 313
v=0
o=MxSIP 0 0 IN IP4 10.7.10.51
s=SIP Call
c=IN IP4 10.7.10.51
t=0 0
m=audio 3000 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=silenceSupp:off - - - -
a=crypto:1 AES_CM_128_HMAC_SHA1_80
inline:ZXJ1UmhNLDFmQGNHYGAnRlpKbjEudk9Gfjh8blo/
a=fmtp:101 0-15
a=ptime:20
a=sendrecv
<------------->
--- (14 headers 13 lines) ---
Found RTP audio format 0
Found RTP audio format 101
Peer audio RTP is at port 10.7.10.51:3000
Found audio description format PCMU for ID 0
Found audio description format telephone-event for ID 101
Capabilities: us - 0x4 (ulaw), peer - audio=0x4 (ulaw)/video=0x0
(nothing)/text=0x0 (nothing), combined - 0x4 (ulaw)
Non-codec capabilities (dtmf): us - 0x1 (telephone-event), peer - 0x1
(telephone-event), combined - 0x1 (telephone-event)
Peer audio RTP is at port 10.7.10.51:3000
list_route: hop: <sip:[EMAIL PROTECTED]:5060>
set_destination: Parsing <sip:[EMAIL PROTECTED]:5060> for address/port to send
to
set_destination: set destination to 10.7.10.51, port 5060
Transmitting (NAT) to 10.7.10.51:5060:
ACK sip:[EMAIL PROTECTED]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.7.10.1:5060;branch=z9hG4bK6476d991;rport
Max-Forwards: 70
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Contact: <sip:[EMAIL PROTECTED]:5060>
Call-ID: [EMAIL PROTECTED]
CSeq: 102 ACK
User-Agent: Asterisk PBX 1.6.0-beta2
Remote-Party-ID: "5253" <sip:[EMAIL PROTECTED]>;privacy=off;screen=no
Content-Length: 0
---
-- SIP/5878-08250098 answered SIP/5253-0823eab0
-- Packet2Packet bridging SIP/5253-0823eab0 and SIP/5878-08250098
<--- SIP read from UDP://10.7.10.51:5060 --->
INVITE sip:[EMAIL PROTECTED]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.7.10.51:5060;branch=z9hG4bKd79bb4c662d65595a
Max-Forwards: 70
From: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
To: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
Call-ID: [EMAIL PROTECTED]
CSeq: 20367 INVITE
Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, OPTIONS, UPDATE, PRACK,
SUBSCRIBE, INFO
Allow-Events: talk, hold, conference
Contact: 5878 <sip:[EMAIL PROTECTED]:5060>
Supported: timer, 100rel, replaces
User-Agent: Aastra 53i/2.1.0.2145
Content-Type: application/sdp
Content-Length: 278
v=0
o=MxSIP 0 1 IN IP4 10.7.10.51
s=SIP Call
c=IN IP4 10.7.10.51
t=0 0
m=audio 3000 RTP/AVP 0 8 18 101
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=rtpmap:101 telephone-event/8000
a=silenceSupp:on - - - -
a=fmtp:101 0-15
a=ptime:30
a=sendonly
<------------->
--- (14 headers 14 lines) ---
Sending to 10.7.10.51 : 5060 (NAT)
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 10.7.10.51:3000
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 - 0x4 (ulaw), peer - audio=0x10c (ulaw|alaw|g729)/video=0x0
(nothing)/text=0x0 (nothing), combined - 0x4 (ulaw)
Non-codec capabilities (dtmf): us - 0x1 (telephone-event), peer - 0x1
(telephone-event), combined - 0x1 (telephone-event)
Peer audio RTP is at port 10.7.10.51:3000
<--- Transmitting (NAT) to 10.7.10.51:5060 --->
SIP/2.0 100 Trying
Via: SIP/2.0/UDP
10.7.10.51:5060;branch=z9hG4bKd79bb4c662d65595a;received=10.7.10.51
From: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
To: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
Call-ID: [EMAIL PROTECTED]
CSeq: 20367 INVITE
User-Agent: Asterisk PBX 1.6.0-beta2
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces, timer
Contact: <sip:[EMAIL PROTECTED]:5060>
Content-Length: 0
<------------>
Audio is at 10.7.10.1 port 19968
Adding codec 0x4 (ulaw) to SDP
Adding non-codec 0x1 (telephone-event) to SDP
<--- Transmitting (NAT) to 10.7.10.51:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP
10.7.10.51:5060;branch=z9hG4bKd79bb4c662d65595a;received=10.7.10.51
From: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
To: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
Call-ID: [EMAIL PROTECTED]
CSeq: 20367 INVITE
User-Agent: Asterisk PBX 1.6.0-beta2
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces, timer
Contact: <sip:[EMAIL PROTECTED]:5060>
Content-Type: application/sdp
Content-Length: 259
v=0
o=root 864806723 864806724 IN IP4 10.7.10.1
s=Asterisk PBX 1.6.0-beta2
c=IN IP4 10.7.10.1
t=0 0
m=audio 19968 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=recvonly
<------------>
-- Started music on hold, class 'default', on SIP/5253-0823eab0
<--- SIP read from UDP://10.7.10.51:5060 --->
ACK sip:[EMAIL PROTECTED]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.7.10.51:5060;branch=z9hG4bKb0a1c610b19e25613
Max-Forwards: 70
From: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
To: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
Call-ID: [EMAIL PROTECTED]
CSeq: 20367 ACK
User-Agent: Aastra 53i/2.1.0.2145
Content-Length: 0
<------------->
--- (9 headers 0 lines) ---
<--- SIP read from UDP://10.7.10.51:5060 --->
REFER sip:[EMAIL PROTECTED]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.7.10.51:5060;branch=z9hG4bKb535a71447a137a4e
Max-Forwards: 70
From: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
To: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
Call-ID: [EMAIL PROTECTED]
CSeq: 20368 REFER
Allow: INVITE, ACK, CANCEL, BYE, NOTIFY, REFER, OPTIONS, UPDATE, PRACK,
SUBSCRIBE, INFO
Allow-Events: talk, hold, conference
Contact: 5878 <sip:[EMAIL PROTECTED]:5060>
Refer-To: 101 <sip:[EMAIL PROTECTED]:5060>
Referred-By: <sip:[EMAIL PROTECTED]>
Supported: timer
User-Agent: Aastra 53i/2.1.0.2145
Content-Length: 0
<------------->
--- (15 headers 0 lines) ---
Call [EMAIL PROTECTED] got a SIP call transfer from caller: (REFER)!
SIP transfer to extension [EMAIL PROTECTED] by [EMAIL PROTECTED]
<--- Transmitting (NAT) to 10.7.10.51:5060 --->
SIP/2.0 202 Accepted
Via: SIP/2.0/UDP
10.7.10.51:5060;branch=z9hG4bKb535a71447a137a4e;received=10.7.10.51
From: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
To: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
Call-ID: [EMAIL PROTECTED]
CSeq: 20368 REFER
User-Agent: Asterisk PBX 1.6.0-beta2
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces, timer
Contact: <sip:[EMAIL PROTECTED]:5060>
Content-Length: 0
<------------>
set_destination: Parsing <sip:[EMAIL PROTECTED]:5060> for address/port to send
to
set_destination: set destination to 10.7.10.51, port 5060
Reliably Transmitting (NAT) to 10.7.10.51:5060:
NOTIFY sip:[EMAIL PROTECTED]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.7.10.1:5060;branch=z9hG4bK23e5b645;rport
Max-Forwards: 70
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Contact: <sip:[EMAIL PROTECTED]:5060>
Call-ID: [EMAIL PROTECTED]
CSeq: 103 NOTIFY
User-Agent: Asterisk PBX 1.6.0-beta2
Remote-Party-ID: "5253" <sip:[EMAIL PROTECTED]>;privacy=off;screen=no
Event: refer;id=20368
Subscription-state: active
Content-Type: message/sipfrag;version=2.0
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces, timer
Content-Length: 21
SIP/2.0 183 Ringing
---
-- Stopped music on hold on SIP/5253-0823eab0
set_destination: Parsing <sip:[EMAIL PROTECTED]:5060> for address/port to send
to
set_destination: set destination to 10.7.10.51, port 5060
Reliably Transmitting (NAT) to 10.7.10.51:5060:
NOTIFY sip:[EMAIL PROTECTED]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.7.10.1:5060;branch=z9hG4bK1431d66c;rport
Max-Forwards: 70
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Contact: <sip:[EMAIL PROTECTED]:5060>
Call-ID: [EMAIL PROTECTED]
CSeq: 104 NOTIFY
User-Agent: Asterisk PBX 1.6.0-beta2
Remote-Party-ID: "5253" <sip:[EMAIL PROTECTED]>;privacy=off;screen=no
Event: refer;id=20368
Subscription-state: terminated;reason=noresource
Content-Type: message/sipfrag;version=2.0
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces, timer
Content-Length: 16
SIP/2.0 200 Ok
---
Scheduling destruction of SIP dialog '[EMAIL PROTECTED]' in 32000 ms (Method:
REFER)
== Spawn extension (phones, 101, 0) exited non-zero on 'SIP/5253-0823eab0'
<--- SIP read from UDP://10.7.10.51:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP
10.7.10.1:5060;branch=z9hG4bK23e5b645;rport=5060;received=10.7.10.1
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Call-ID: [EMAIL PROTECTED]
CSeq: 103 NOTIFY
Server: Aastra 53i/2.1.0.2145
Content-Length: 0
<------------->
--- (8 headers 0 lines) ---
<--- SIP read from UDP://10.7.10.51:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP
10.7.10.1:5060;branch=z9hG4bK1431d66c;rport=5060;received=10.7.10.1
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Call-ID: [EMAIL PROTECTED]
CSeq: 104 NOTIFY
Server: Aastra 53i/2.1.0.2145
Content-Length: 0
<------------->
--- (8 headers 0 lines) ---
SIP Response message for INCOMING dialog NOTIFY arrived
Retransmitting #1 (NAT) to 10.7.10.51:5060:
NOTIFY sip:[EMAIL PROTECTED]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.7.10.1:5060;branch=z9hG4bK23e5b645;rport
Max-Forwards: 70
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Contact: <sip:[EMAIL PROTECTED]:5060>
Call-ID: [EMAIL PROTECTED]
CSeq: 103 NOTIFY
User-Agent: Asterisk PBX 1.6.0-beta2
Remote-Party-ID: "5253" <sip:[EMAIL PROTECTED]>;privacy=off;screen=no
Event: refer;id=20368
Subscription-state: active
Content-Type: message/sipfrag;version=2.0
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces, timer
Content-Length: 21
SIP/2.0 183 Ringing
---
<--- SIP read from UDP://10.7.10.51:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP
10.7.10.1:5060;branch=z9hG4bK23e5b645;rport=5060;received=10.7.10.1
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Call-ID: [EMAIL PROTECTED]
CSeq: 103 NOTIFY
Server: Aastra 53i/2.1.0.2145
Content-Length: 0
<------------->
--- (8 headers 0 lines) ---
Retransmitting #2 (NAT) to 10.7.10.51:5060:
NOTIFY sip:[EMAIL PROTECTED]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.7.10.1:5060;branch=z9hG4bK23e5b645;rport
Max-Forwards: 70
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Contact: <sip:[EMAIL PROTECTED]:5060>
Call-ID: [EMAIL PROTECTED]
CSeq: 103 NOTIFY
User-Agent: Asterisk PBX 1.6.0-beta2
Remote-Party-ID: "5253" <sip:[EMAIL PROTECTED]>;privacy=off;screen=no
Event: refer;id=20368
Subscription-state: active
Content-Type: message/sipfrag;version=2.0
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces, timer
Content-Length: 21
SIP/2.0 183 Ringing
---
<--- SIP read from UDP://10.7.10.51:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP
10.7.10.1:5060;branch=z9hG4bK23e5b645;rport=5060;received=10.7.10.1
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Call-ID: [EMAIL PROTECTED]
CSeq: 103 NOTIFY
Server: Aastra 53i/2.1.0.2145
Content-Length: 0
<------------->
--- (8 headers 0 lines) ---
Retransmitting #3 (NAT) to 10.7.10.51:5060:
NOTIFY sip:[EMAIL PROTECTED]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.7.10.1:5060;branch=z9hG4bK23e5b645;rport
Max-Forwards: 70
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Contact: <sip:[EMAIL PROTECTED]:5060>
Call-ID: [EMAIL PROTECTED]
CSeq: 103 NOTIFY
User-Agent: Asterisk PBX 1.6.0-beta2
Remote-Party-ID: "5253" <sip:[EMAIL PROTECTED]>;privacy=off;screen=no
Event: refer;id=20368
Subscription-state: active
Content-Type: message/sipfrag;version=2.0
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces, timer
Content-Length: 21
SIP/2.0 183 Ringing
---
<--- SIP read from UDP://10.7.10.51:5060 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP
10.7.10.1:5060;branch=z9hG4bK23e5b645;rport=5060;received=10.7.10.1
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Call-ID: [EMAIL PROTECTED]
CSeq: 103 NOTIFY
Server: Aastra 53i/2.1.0.2145
Content-Length: 0
<------------->
--- (8 headers 0 lines) ---
[Jan 29 19:12:53] NOTICE[19010]: chan_sip.c:8869 sip_reregister: --
Re-registration for [EMAIL PROTECTED]@sip.broadvoice.com
[Jan 29 19:12:53] NOTICE[19010]: chan_sip.c:14782 handle_response_register:
Outbound Registration: Expiry for sip.broadvoice.com is 30 sec (Scheduling
reregistration in 23 s)
Retransmitting #4 (NAT) to 10.7.10.51:5060:
NOTIFY sip:[EMAIL PROTECTED]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.7.10.1:5060;branch=z9hG4bK23e5b645;rport
Max-Forwards: 70
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Contact: <sip:[EMAIL PROTECTED]:5060>
Call-ID: [EMAIL PROTECTED]
CSeq: 103 NOTIFY
User-Agent: Asterisk PBX 1.6.0-beta2
Remote-Party-ID: "5253" <sip:[EMAIL PROTECTED]>;privacy=off;screen=no
Event: refer;id=20368
Subscription-state: active
Content-Type: message/sipfrag;version=2.0
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Supported: replaces, timer
Content-Length: 21
SIP/2.0 183 Ringing
---
<--- SIP read from UDP://10.7.10.51:5060 --->
SIP/2.0 500 CSeq Number Out of order
Via: SIP/2.0/UDP
10.7.10.1:5060;branch=z9hG4bK23e5b645;rport=5060;received=10.7.10.1
From: "5253" <sip:[EMAIL PROTECTED]>;tag=as05a48c1a
To: <sip:[EMAIL PROTECTED]:5060>;tag=694417843
Call-ID: [EMAIL PROTECTED]
CSeq: 103 NOTIFY
Server: Aastra 53i/2.1.0.2145
Content-Length: 0
<------------->
--- (8 headers 0 lines) ---
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