[Serusers] SER truncates long INVITES relayed from products such as Ingate and Jasomi
Giudice, Salvatore
Salvatore.Giudice at FMR.COM
Tue Sep 14 22:23:53 CEST 2004
I believe that we have identified a bug in SER related to limitations in
the size of the SIP message SER will t_relay. This bug is easily
reproducible and is described as follows:
Infrastructure description:
Internet <-> SER/rtpproxy 8.14 <-> Asterisk SIP2PSTN GW
1.) In my setup, I am using Asterisk as a SIP2PSTN gateway.
2.) Asterisk is deployed on a non-routable address segment.
3.) I have SER/rtpproxy 8.14 deployed on an internet routable
segment.
4.) Users register to SER at the DMZ border.
5.) When a user makes a telephone call, SER t_relay's the INVITE in
Asterisk
6.) During call setup, rtpproxy is used to connect rtp from the
caller to the Asterisk GW.
Problem description:
With the current setup, a user can take a phone such as a Cisco 7960 or
Xten soft phone and successfully register, make calls, and receive
calls. These clients may be behind NAT firewalls. SER is resolving NAT
configuration issues with the assistance of the NAThelper module.
Recently, we began testing with products from Ingate and Jasomi.
Customers are intent on using these vendor supplied solutions to enable
UA's hosted on their corporate intranets to access external sip
services. Each solution is deployed in a similar manner. This
architecture is described as follows:
1.) An Ingate or Jasomi is deployed on an internet routable segment.
2.) A second ingate or Jasomi is deployed on a non-routable intranet
facing segment.
3.) An ipsec tunnel is constructed between the two ingates.
In this segment, UA's on the intranet use the intranet Ingate or Jasomi
as a standard SIP proxy to access external SIP services. To facilitate
this, both are configured in a "hard forward" manner to push SIP traffic
across the ipsec tunnel to the seconds Ingate or Jasomi. We have
successfully registered from the intranet to our internet facing SER
implementation through this setup. We are also able to make calls from
our intranet through this proxy setup internet facing 3rd party SIP end
points. However, when we attempt to send an INVITE to our SER/rtpproxy
infrastructure, SER truncates the INVITE when it is forwarded to our
Asterisk GW. Asterisk follows through with the INVITE process and will
ring the intended phone. However, when the called party answers,
Asterisk is unable to complete call setup because the "a" and "m"
parameters are missing from the SDP. At this point the called party is
dropped and the Ingate and the UA are left waiting for the RTP or a BYE
that never comes.
>From our observation, this problem is due to the size of the SIP INVITE,
which is sent to SER. Both Ingate and Jasomi create additional VIA
parameters in the SIP INVITE in order to store state information. This
state information is stored in encrypted strings in the xdata field of
the VIA. It seems that the addition of these VIA fields increases the
size of the SIP message beyond the SER's limits causing truncation upon
relay. When the INVITE is t_relay'ed, much of the SDP is missing.
Please see the following ngrep of the SIP INVITE being relayed. I have
replaced all pertinent address information for our own disclosure
purposes.
______________________________________________
Device list:
Ingate: 10.1.1.1
SER: 10.2.2.2/sbc1.mydomain.com
Xten UA: 10.3.3.3
Asterisk gw: 10.4.4.4
##
U 10.1.1.1:5060 -> 10.2.2.2:5060
INVITE sip:16179086547 at sbc1.mydomain.com SIP/2.0.
Via: SIP/2.0/UDP
10.1.1.1:5060;branch=z9hG4bK8d1c8a92109d8a370c7f7299b985c8f4.0.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK94ce1c153879cbc60c7f7299b985c8f4.0;xdata=UkrU+mWJL
aKZXFCdTMwK3YcFmw9BXXO0mZ-oXaK-fZQ_.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bKA3614A811BC64CCB8E74944E08E28F13;rport=35060;branc
h=z9hG4bKA3614A811BC64CCB8E74944E08E28F13;xdata=8BnRlTLlFQxaEMygbWSMP79K
bMGMDOh+FcKZmz3mvlR09UTlKI5NKdRfAsMB1v-2.
From: Test User <sip:6173164000 at sbc1.mydomain.com:35060>;tag=4167926089.
To: <sip:16179086547 at sbc1.mydomain.com>.
Contact:
<sip:esF1vz2EczTjGzG7n6VSFaJSXkL7bF2zwIo3bfnGcryex2fyUkto0gwwTTREPunT71-
RsgM6xtWrz8Yc_PUuyGwcHdfV0OieldqEwsaPMEJLsA5in1v1fKYFFWpWOtqrj at 10.1.1.1>
.
Call-ID: 537E6EED-0DCD-4DDF-AE66-EDCC8A95DC79 at 10.3.3.3.
CSeq: 12666 INVITE.
Max-Forwards: 68.
Content-Type: application/sdp.
User-Agent: X-Lite release 1103m.
Record-Route: <sip:dd4f232 at 10.1.1.1;lr>.
Record-Route:
<sip:eDpENJ1vtGdOGot7umZmcMs7cLQcpirjPwNAsYLWoPXQlOnCIQZXXwov084odkZ_h at 1
0.1.1.1;lr>.
Content-Length: 230.
.
v=0.
o=6173164000 94360252 94360262 IN IP4 10.1.1.1.
s=X-Lite.
c=IN IP4 10.1.1.1.
t=0 0.
m=audio 58192 RTP/AVP 0 8 101.
a=rtpmap:0 pcmu/8000.
a=rtpmap:8 pcma/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-15.
#
U 10.2.2.2:5060 -> 10.1.1.1:5060
SIP/2.0 407 Proxy Authentication Required.
Via: SIP/2.0/UDP
10.1.1.1:5060;branch=z9hG4bK8d1c8a92109d8a370c7f7299b985c8f4.0.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK94ce1c153879cbc60c7f7299b985c8f4.0;xdata=UkrU+mWJL
aKZXFCdTMwK3YcFmw9BXXO0mZ-oXaK-fZQ_.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bKA3614A811BC64CCB8E74944E08E28F13;rport=35060;branc
h=z9hG4bKA3614A811BC64CCB8E74944E08E28F13;xdata=8BnRlTLlFQxaEMygbWSMP79K
bMGMDOh+FcKZmz3mvlR09UTlKI5NKdRfAsMB1v-2.
From: Test User <sip:6173164000 at sbc1.mydomain.com:35060>;tag=4167926089.
To:
<sip:16179086547 at sbc1.mydomain.com>;tag=b27e1a1d33761e85846fc98f5f3a7e58
.6c1d.
Call-ID: 537E6EED-0DCD-4DDF-AE66-EDCC8A95DC79 at 10.3.3.3.
CSeq: 12666 INVITE.
Proxy-Authenticate: Digest realm="sbc1.mydomain.com",
nonce="4140d569a58f4230a925f11b564c223a856b792a".
Server: Sip EXpress router (0.8.14 (i386/linux)).
Content-Length: 0.
Warning: 392 10.2.2.2:5060 "Noisy feedback tells: pid=26357
req_src_ip=10.1.1.1 req_src_port=5060
in_uri=sip:16179086547 at sbc1.mydomain.com
out_uri=sip:16179086547 at sbc1.mydomain.com via_cnt==3".
.
#
U 10.1.1.1:5060 -> 10.2.2.2:5060
ACK sip:16179086547 at sbc1.mydomain.com SIP/2.0.
Via: SIP/2.0/UDP
10.1.1.1:5060;branch=z9hG4bK8d1c8a92109d8a370c7f7299b985c8f4.0.
From: Test User <sip:6173164000 at sbc1.mydomain.com:35060>;tag=4167926089.
To:
<sip:16179086547 at sbc1.mydomain.com>;tag=b27e1a1d33761e85846fc98f5f3a7e58
.6c1d.
Call-ID: 537E6EED-0DCD-4DDF-AE66-EDCC8A95DC79 at 10.3.3.3.
CSeq: 12666 ACK.
Content-Length: 0.
.
#
U 10.1.1.1:5060 -> 10.2.2.2:5060 15763 at 0:1480
.......0INVITE sip:16179086547 at sbc1.mydomain.com SIP/2.0.
Via: SIP/2.0/UDP
10.1.1.1:5060;branch=z9hG4bK3fb33a2d10203ada0c7f7299b985c8f4.0.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK4afb43404e7c33130c7f7299b985c8f4.0;xdata=Ly0nkoyID
7sZ1hOYXRKnV3gFIgkEphTIhD00WmRnWSo_.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK080E9671A10348788D72788ABB32E000;rport=35060;branc
h=z9hG4bK080E9671A10348788D72788ABB32E000;xdata=g8U1gLW+1SbzScgzuAlduOZY
SyicHJNYp0Htso2oJc909UTlKI5NKdRfAsMB1v-2.
From: Test User <sip:6173164000 at sbc1.mydomain.com:35060>;tag=4167926089.
To: <sip:16179086547 at sbc1.mydomain.com>.
Contact:
<sip:e2AyJyUQgCGf_Y06tu_rM3e-U3sthj-vO8pYWVWTJVaikNLrDMx5XcCCLEBXvjyirBs
hBuEUU_feciI091Ig8MNh7KZJzeH1d4fC7EsItfCfsA5in1v1fKYFFWpWOtqrj at 10.1.1.1>
.
Call-ID: 537E6EED-0DCD-4DDF-AE66-EDCC8A95DC79 at 10.3.3.3.
CSeq: 12667 INVITE.
Proxy-Authorization: Digest
username="6173164000",realm="sbc1.mydomain.com",nonce="4140d569a58f4230a
925f11b564c223a856b792a",response="e9a140cc3bad75e35c6a96449ff7cc41",uri
="sip:16179086547 at sbc1.mydomain.com".
Max-Forwards: 68.
Content-Type: application/sdp.
User-Agent: X-Lite release 1103m.
Record-Route: <sip:dd4f232 at 10.1.1.1;lr>.
Record-Route:
<sip:e7DlN09kmHaZbabZRm9W0bzJ0uoyUyFM0PVyKvgCloKvDqsLXMsCA6nvRkR8LsbRi at 1
0.1.1.1;lr>.
Content-Length: 230.
.
v=0.
o=6173164000 94360252 94360262 IN IP4 10.1.1.1.
s=X-Lite.
c=IN IP4 10.1.1.1.
t=0 0.
m=audio 58194 RTP/AVP 0 8 101.
a=rtpmap:0 pcmu/8000.
a=rtpmap:8 pcma
#
U 10.2.2.2:5060 -> 10.1.1.1:5060
SIP/2.0 100 trying -- your call is important to us.
Via: SIP/2.0/UDP
10.1.1.1:5060;branch=z9hG4bK3fb33a2d10203ada0c7f7299b985c8f4.0.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK4afb43404e7c33130c7f7299b985c8f4.0;xdata=Ly0nkoyID
7sZ1hOYXRKnV3gFIgkEphTIhD00WmRnWSo_.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK080E9671A10348788D72788ABB32E000;rport=35060;branc
h=z9hG4bK080E9671A10348788D72788ABB32E000;xdata=g8U1gLW+1SbzScgzuAlduOZY
SyicHJNYp0Htso2oJc909UTlKI5NKdRfAsMB1v-2.
From: Test User <sip:6173164000 at sbc1.mydomain.com:35060>;tag=4167926089.
To: <sip:16179086547 at sbc1.mydomain.com>.
Call-ID: 537E6EED-0DCD-4DDF-AE66-EDCC8A95DC79 at 10.3.3.3.
CSeq: 12667 INVITE.
Server: Sip EXpress router (0.8.14 (i386/linux)).
Content-Length: 0.
Warning: 392 10.2.2.2:5060 "Noisy feedback tells: pid=26356
req_src_ip=10.1.1.1 req_src_port=5060
in_uri=sip:16179086547 at sbc1.mydomain.com
out_uri=sip:16179086547 at 10.4.4.4:5060 via_cnt==3".
.
#
U 10.2.2.2:5060 -> 10.4.4.4:5060 64701 at 0:1480
.......qINVITE sip:16179086547 at 10.4.4.4:5060 SIP/2.0.
Record-Route: <sip:16179086547 at 10.2.2.2;ftag=4167926089;lr=on>.
Via: SIP/2.0/UDP 10.2.2.2;branch=z9hG4bKa01f.bbf787d1.0.
Via: SIP/2.0/UDP
10.1.1.1:5060;branch=z9hG4bK3fb33a2d10203ada0c7f7299b985c8f4.0.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK4afb43404e7c33130c7f7299b985c8f4.0;xdata=Ly0nkoyID
7sZ1hOYXRKnV3gFIgkEphTIhD00WmRnWSo_.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK080E9671A10348788D72788ABB32E000;rport=35060;branc
h=z9hG4bK080E9671A10348788D72788ABB32E000;xdata=g8U1gLW+1SbzScgzuAlduOZY
SyicHJNYp0Htso2oJc909UTlKI5NKdRfAsMB1v-2.
From: Test User <sip:6173164000 at sbc1.mydomain.com:35060>;tag=4167926089.
To: <sip:16179086547 at sbc1.mydomain.com>.
Contact:
<sip:e2AyJyUQgCGf_Y06tu_rM3e-U3sthj-vO8pYWVWTJVaikNLrDMx5XcCCLEBXvjyirBs
hBuEUU_feciI091Ig8MNh7KZJzeH1d4fC7EsItfCfsA5in1v1fKYFFWpWOtqrj at 10.1.1.1>
.
Call-ID: 537E6EED-0DCD-4DDF-AE66-EDCC8A95DC79 at 10.3.3.3.
CSeq: 12667 INVITE.
Proxy-Authorization: Digest
username="6173164000",realm="sbc1.mydomain.com",nonce="4140d569a58f4230a
925f11b564c223a856b792a",response="e9a140cc3bad75e35c6a96449ff7cc41",uri
="sip:16179086547 at sbc1.mydomain.com".
Max-Forwards: 67.
Content-Type: application/sdp.
User-Agent: X-Lite release 1103m.
Record-Route: <sip:dd4f232 at 10.1.1.1;lr>.
Record-Route:
<sip:e7DlN09kmHaZbabZRm9W0bzJ0uoyUyFM0PVyKvgCloKvDqsLXMsCA6nvRkR8LsbRi at 1
0.1.1.1;lr>.
Content-Length: 230.
.
v=0.
o=6173164000 94360252 94360262 I
#
U 10.2.2.2:5060 -> 10.4.4.4:5060 64702 at 0:1480
.......qINVITE sip:16179086547 at 10.4.4.4:5060 SIP/2.0.
Record-Route: <sip:16179086547 at 10.2.2.2;ftag=4167926089;lr=on>.
Via: SIP/2.0/UDP 10.2.2.2;branch=z9hG4bKa01f.bbf787d1.0.
Via: SIP/2.0/UDP
10.1.1.1:5060;branch=z9hG4bK3fb33a2d10203ada0c7f7299b985c8f4.0.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK4afb43404e7c33130c7f7299b985c8f4.0;xdata=Ly0nkoyID
7sZ1hOYXRKnV3gFIgkEphTIhD00WmRnWSo_.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK080E9671A10348788D72788ABB32E000;rport=35060;branc
h=z9hG4bK080E9671A10348788D72788ABB32E000;xdata=g8U1gLW+1SbzScgzuAlduOZY
SyicHJNYp0Htso2oJc909UTlKI5NKdRfAsMB1v-2.
From: Test User <sip:6173164000 at sbc1.mydomain.com:35060>;tag=4167926089.
To: <sip:16179086547 at sbc1.mydomain.com>.
Contact:
<sip:e2AyJyUQgCGf_Y06tu_rM3e-U3sthj-vO8pYWVWTJVaikNLrDMx5XcCCLEBXvjyirBs
hBuEUU_feciI091Ig8MNh7KZJzeH1d4fC7EsItfCfsA5in1v1fKYFFWpWOtqrj at 10.1.1.1>
.
Call-ID: 537E6EED-0DCD-4DDF-AE66-EDCC8A95DC79 at 10.3.3.3.
CSeq: 12667 INVITE.
Proxy-Authorization: Digest
username="6173164000",realm="sbc1.mydomain.com",nonce="4140d569a58f4230a
925f11b564c223a856b792a",response="e9a140cc3bad75e35c6a96449ff7cc41",uri
="sip:16179086547 at sbc1.mydomain.com".
Max-Forwards: 67.
Content-Type: application/sdp.
User-Agent: X-Lite release 1103m.
Record-Route: <sip:dd4f232 at 10.1.1.1;lr>.
Record-Route:
<sip:e7DlN09kmHaZbabZRm9W0bzJ0uoyUyFM0PVyKvgCloKvDqsLXMsCA6nvRkR8LsbRi at 1
0.1.1.1;lr>.
Content-Length: 230.
.
v=0.
o=6173164000 94360252 94360262 I
#
U 10.4.4.4:5060 -> 10.2.2.2:5060
SIP/2.0 100 Trying.
Via: SIP/2.0/UDP 10.2.2.2;branch=z9hG4bKa01f.bbf787d1.0.
Via: SIP/2.0/UDP
10.1.1.1:5060;branch=z9hG4bK3fb33a2d10203ada0c7f7299b985c8f4.0.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK4afb43404e7c33130c7f7299b985c8f4.0;xdata=Ly0nkoyID
7sZ1hOYXRKnV3gFIgkEphTIhD00WmRnWSo_.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK080E9671A10348788D72788ABB32E000;rport=35060;branc
h=z9hG4bK080E9671A10348788D72788ABB32E000;xdata=g8U1gLW+1SbzScgzuAlduOZY
SyicHJNYp0Htso2oJc909UTlKI5NKdRfAsMB1v-2.
From: Test User <sip:6173164000 at sbc1.mydomain.com:35060>;tag=4167926089.
To: <sip:16179086547 at sbc1.mydomain.com>;tag=as3b7f7d4e.
Call-ID: 537E6EED-0DCD-4DDF-AE66-EDCC8A95DC79 at 10.3.3.3.
CSeq: 12667 INVITE.
User-Agent: Asterisk PBX.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER.
Contact: <sip:16179086547 at 10.4.4.4>.
Content-Length: 0.
.
#
U 10.4.4.4:5060 -> 10.2.2.2:5060
SIP/2.0 183 Session Progress.
Via: SIP/2.0/UDP 10.2.2.2;branch=z9hG4bKa01f.bbf787d1.0.
Via: SIP/2.0/UDP
10.1.1.1:5060;branch=z9hG4bK3fb33a2d10203ada0c7f7299b985c8f4.0.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK4afb43404e7c33130c7f7299b985c8f4.0;xdata=Ly0nkoyID
7sZ1hOYXRKnV3gFIgkEphTIhD00WmRnWSo_.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK080E9671A10348788D72788ABB32E000;rport=35060;branc
h=z9hG4bK080E9671A10348788D72788ABB32E000;xdata=g8U1gLW+1SbzScgzuAlduOZY
SyicHJNYp0Htso2oJc909UTlKI5NKdRfAsMB1v-2.
From: Test User <sip:6173164000 at sbc1.mydomain.com:35060>;tag=4167926089.
To: <sip:16179086547 at sbc1.mydomain.com>;tag=as3b7f7d4e.
Call-ID: 537E6EED-0DCD-4DDF-AE66-EDCC8A95DC79 at 10.3.3.3.
CSeq: 12667 INVITE.
User-Agent: Asterisk PBX.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER.
Contact: <sip:16179086547 at 10.4.4.4>.
Content-Type: application/sdp.
Content-Length: 259.
.
v=0.
o=root 4025 4025 IN IP4 10.4.4.4.
s=session.
c=IN IP4 10.4.4.4.
t=0 0.
m=audio 19052 RTP/AVP 3 0 8 101.
a=rtpmap:3 GSM/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=silenceSupp:off - - - -.
#
U 10.2.2.2:5060 -> 10.1.1.1:5060
SIP/2.0 183 Session Progress.
Via: SIP/2.0/UDP
10.1.1.1:5060;branch=z9hG4bK3fb33a2d10203ada0c7f7299b985c8f4.0.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK4afb43404e7c33130c7f7299b985c8f4.0;xdata=Ly0nkoyID
7sZ1hOYXRKnV3gFIgkEphTIhD00WmRnWSo_.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK080E9671A10348788D72788ABB32E000;rport=35060;branc
h=z9hG4bK080E9671A10348788D72788ABB32E000;xdata=g8U1gLW+1SbzScgzuAlduOZY
SyicHJNYp0Htso2oJc909UTlKI5NKdRfAsMB1v-2.
From: Test User <sip:6173164000 at sbc1.mydomain.com:35060>;tag=4167926089.
To: <sip:16179086547 at sbc1.mydomain.com>;tag=as3b7f7d4e.
Call-ID: 537E6EED-0DCD-4DDF-AE66-EDCC8A95DC79 at 10.3.3.3.
CSeq: 12667 INVITE.
User-Agent: Asterisk PBX.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER.
Contact: <sip:16179086547 at 10.4.4.4>.
Content-Type: application/sdp.
Content-Length: 259.
.
v=0.
o=root 4025 4025 IN IP4 10.4.4.4.
s=session.
c=IN IP4 10.4.4.4.
t=0 0.
m=audio 19052 RTP/AVP 3 0 8 101.
a=rtpmap:3 GSM/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=silenceSupp:off - - - -.
####
U 10.4.4.4:5060 -> 10.2.2.2:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 10.2.2.2;branch=z9hG4bKa01f.bbf787d1.0.
Via: SIP/2.0/UDP
10.1.1.1:5060;branch=z9hG4bK3fb33a2d10203ada0c7f7299b985c8f4.0.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK4afb43404e7c33130c7f7299b985c8f4.0;xdata=Ly0nkoyID
7sZ1hOYXRKnV3gFIgkEphTIhD00WmRnWSo_.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK080E9671A10348788D72788ABB32E000;rport=35060;branc
h=z9hG4bK080E9671A10348788D72788ABB32E000;xdata=g8U1gLW+1SbzScgzuAlduOZY
SyicHJNYp0Htso2oJc909UTlKI5NKdRfAsMB1v-2.
Record-Route: <sip:16179086547 at 10.2.2.2;ftag=4167926089;lr=on>.
Record-Route: <sip:dd4f232 at 10.1.1.1;lr>.
Record-Route:
<sip:e7DlN09kmHaZbabZRm9W0bzJ0uoyUyFM0PVyKvgCloKvDqsLXMsCA6nvRkR8LsbRi at 1
0.1.1.1;lr>.
From: Test User <sip:6173164000 at sbc1.mydomain.com:35060>;tag=4167926089.
To: <sip:16179086547 at sbc1.mydomain.com>;tag=as3b7f7d4e.
Call-ID: 537E6EED-0DCD-4DDF-AE66-EDCC8A95DC79 at 10.3.3.3.
CSeq: 12667 INVITE.
User-Agent: Asterisk PBX.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER.
Contact: <sip:16179086547 at 10.4.4.4>.
Content-Type: application/sdp.
Content-Length: 259.
.
v=0.
o=root 4025 4026 IN IP4 10.4.4.4.
s=session.
c=IN IP4 10.4.4.4.
t=0 0.
m=audio 19052 RTP/AVP 3 0 8 101.
a=rtpmap:3 GSM/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=silenceSupp:off - - - -.
#
U 10.2.2.2:5060 -> 10.1.1.1:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP
10.1.1.1:5060;branch=z9hG4bK3fb33a2d10203ada0c7f7299b985c8f4.0.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK4afb43404e7c33130c7f7299b985c8f4.0;xdata=Ly0nkoyID
7sZ1hOYXRKnV3gFIgkEphTIhD00WmRnWSo_.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK080E9671A10348788D72788ABB32E000;rport=35060;branc
h=z9hG4bK080E9671A10348788D72788ABB32E000;xdata=g8U1gLW+1SbzScgzuAlduOZY
SyicHJNYp0Htso2oJc909UTlKI5NKdRfAsMB1v-2.
Record-Route: <sip:16179086547 at 10.2.2.2;ftag=4167926089;lr=on>.
Record-Route: <sip:dd4f232 at 10.1.1.1;lr>.
Record-Route:
<sip:e7DlN09kmHaZbabZRm9W0bzJ0uoyUyFM0PVyKvgCloKvDqsLXMsCA6nvRkR8LsbRi at 1
0.1.1.1;lr>.
From: Test User <sip:6173164000 at sbc1.mydomain.com:35060>;tag=4167926089.
To: <sip:16179086547 at sbc1.mydomain.com>;tag=as3b7f7d4e.
Call-ID: 537E6EED-0DCD-4DDF-AE66-EDCC8A95DC79 at 10.3.3.3.
CSeq: 12667 INVITE.
User-Agent: Asterisk PBX.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER.
Contact: <sip:16179086547 at 10.4.4.4>.
Content-Type: application/sdp.
Content-Length: 259.
.
v=0.
o=root 4025 4026 IN IP4 10.4.4.4.
s=session.
c=IN IP4 10.4.4.4.
t=0 0.
m=audio 19052 RTP/AVP 3 0 8 101.
a=rtpmap:3 GSM/8000.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=silenceSupp:off - - - -.
#
U 10.1.1.1:5060 -> 10.2.2.2:5060
ACK sip:16179086547 at 10.4.4.4 SIP/2.0.
Via: SIP/2.0/UDP
10.1.1.1:5060;branch=z9hG4bK3fb33a2d10203ada0c7f7299b985c8f4.0.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK4afb43404e7c33130c7f7299b985c8f4.0;xdata=Ly0nkoyID
7sZ1hOYXRKnV3gFIgkEphTIhD00WmRnWSo_.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK8A5B0DBACBFA421DBE4F707FA2084744;rport=35060;branc
h=z9hG4bK8A5B0DBACBFA421DBE4F707FA2084744;xdata=qDJF1BWCnmazyv84YkNW+wqO
ln1crB-OMdLqm-1dScJ09UTlKI5NKdRfAsMB1v-2.
From: Test User <sip:6173164000 at sbc1.mydomain.com:35060>;tag=4167926089.
To: <sip:16179086547 at sbc1.mydomain.com>;tag=as3b7f7d4e.
Contact:
<sip:e5oUfTi8xf2OqFiDy7UfeA7DqUjH00lIfqT4fsKAkukUTt1duZ_VPH2tfjJwa_F0yN4
ZoQcfeXYHJG2YatOPWrhtr0LX4ucrckG00r17249_sA5in1v1fKYFFWpWOtqrj at 10.1.1.1>
.
Route: <sip:16179086547 at 10.2.2.2;ftag=4167926089;lr=on>.
Call-ID: 537E6EED-0DCD-4DDF-AE66-EDCC8A95DC79 at 10.3.3.3.
CSeq: 12667 ACK.
Max-Forwards: 68.
Content-Length: 0.
.
#
U 10.2.2.2:5060 -> 10.4.4.4:5060
ACK sip:16179086547 at 10.4.4.4 SIP/2.0.
Record-Route: <sip:16179086547 at 10.2.2.2;ftag=4167926089;lr=on>.
Via: SIP/2.0/UDP 10.2.2.2;branch=0.
Via: SIP/2.0/UDP
10.1.1.1:5060;branch=z9hG4bK3fb33a2d10203ada0c7f7299b985c8f4.0.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK4afb43404e7c33130c7f7299b985c8f4.0;xdata=Ly0nkoyID
7sZ1hOYXRKnV3gFIgkEphTIhD00WmRnWSo_.
Via: SIP/2.0/UDP
0.0.0.0;branch=z9hG4bK8A5B0DBACBFA421DBE4F707FA2084744;rport=35060;branc
h=z9hG4bK8A5B0DBACBFA421DBE4F707FA2084744;xdata=qDJF1BWCnmazyv84YkNW+wqO
ln1crB-OMdLqm-1dScJ09UTlKI5NKdRfAsMB1v-2.
From: Test User <sip:6173164000 at sbc1.mydomain.com:35060>;tag=4167926089.
To: <sip:16179086547 at sbc1.mydomain.com>;tag=as3b7f7d4e.
Contact:
<sip:e5oUfTi8xf2OqFiDy7UfeA7DqUjH00lIfqT4fsKAkukUTt1duZ_VPH2tfjJwa_F0yN4
ZoQcfeXYHJG2YatOPWrhtr0LX4ucrckG00r17249_sA5in1v1fKYFFWpWOtqrj at 10.1.1.1>
.
Call-ID: 537E6EED-0DCD-4DDF-AE66-EDCC8A95DC79 at 10.3.3.3.
CSeq: 12667 ACK.
Max-Forwards: 67.
Content-Length: 0.
.
After this ACK is relayed, the call setup is incomplete because asterisk
has dropped the call.
__________________________________________
Salvatore Giudice
617-392-1689
617-392-8120
salvatore.giudice at fmr.com
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