On 10/15/05, Alexander Ph. Lintenhofer <lintenhofer@aon.at> wrote:

Hi everybody,

A short question:

alice@atlanta.com is behind NAT. She uses TCP to connect her UAC to
sip.atlanta.com in the public network.
Inviting bob@biloxi.com suceeds. But Bob can't terminate the call. His
BYE is not routed back, because fix_nated_contact() does only work with
UDP. And Bob builds the R-URI with the Infos of Alice's contact header.

The route is as follows:
alice@atlanta.com [172.16.0.4] -> natbox.atlanta.com [ 172.16.0.1 |
192.168.0.13] -> sip.atlanta.com [192.168.0.14] -> sip.biloxi.com
[192.168.1.14] -> bob@biloxi.com [192.168.1.1]

Possible solutions:
- force_tcp_alias() -> but reading the draft
draft-ietf-sip-connect-reuse-04.txt yields that this must be supported
by the components - so doesn't the snom360 of Alice
- commenting some lines in nathelper.c and activate it for TCP -> this
works pretty fine and the BYE finds its way from Bob through the NAT-Box
to Alice. But this is a dirty solution.

So does anybody has a similar problem? My config works fine with UDP but
switching to TCP makes life hard...
I attached the traces Bob received, his last BYE is finally dropped by
sip.atlanta.com, because the network-address 172.16.0.4 can't be found!

Thank you for your help!
regards, Philipp

=========================================================================

Received from tcp:192.168.1.14:5060 at 15/10/2005 19:18:32:250 (1751 bytes):

INVITE sip:bob@192.168.1.1:2063;transport=tcp;line=wxqurd1s SIP/2.0
Record-Route: <sip: 192.168.1.14;transport=tcp;r2=on;ftag=5s8qncdbso;lr=on>
Record-Route:
<sip:192.168.1.14:5061;transport=tls;r2=on;ftag=5s8qncdbso;lr=on>
Record-Route:
<sip:192.168.0.14:5061;transport=tls;r2=on;ftag=5s8qncdbso;lr=on>
Record-Route: <sip:192.168.0.14;transport=tcp;r2=on;ftag=5s8qncdbso;lr=on>
Via: SIP/2.0/TCP 192.168.1.14;branch=z9hG4bKcad9.057cd815.0;i=d
Via: SIP/2.0/TLS 192.168.0.14:5061;branch=z9hG4bKcad9.685be3c3.0;i=1
Via: SIP/2.0/TCP
172.16.0.4:2327;received=192.168.0.13;branch=z9hG4bK-y79imu6dlqxs;rport=2327
From: "Alice" < sip:alice@atlanta.com>;tag=5s8qncdbso
To: <sip:bob@biloxi.com>
Call-ID: 3c2675cac832-ce5ge5sxlx2q@snom360
CSeq: 1 INVITE
Max-Forwards: 68
Contact: <sip:alice@172.16.0.4 :2327;transport=tcp;line=fyyuh6tl>
P-Key-Flags: resolution="31x13", keys="4"
User-Agent: snom360/4.3
Accept: application/sdp
Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE,
PRACK, MESSAGE, INFO
Allow-Events: talk, hold, refer
Supported: timer, 100rel, replaces, callerid
Session-Expires: 3600
Content-Type: application/sdp
Content-Length: 507
P-hint: outbound
P-hint: forced TLS relay
P-hint: usrloc applied

Sent to tcp:192.168.1.14:5060 at 15/10/2005 19:18:32:270 (929 bytes):

SIP/2.0 180 Ringing
Via: SIP/2.0/TCP 192.168.1.14 ;branch=z9hG4bKcad9.057cd815.0;i=d
Via: SIP/2.0/TLS 192.168.0.14:5061;branch=z9hG4bKcad9.685be3c3.0;i=1
Via: SIP/2.0/TCP
172.16.0.4:2327 ;received=192.168.0.13;branch=z9hG4bK-y79imu6dlqxs;rport=2327
Record-Route: <sip:192.168.1.14;transport=tcp;r2=on;ftag=5s8qncdbso;lr=on>
Record-Route:
<sip:192.168.1.14:5061;transport=tls;r2=on;ftag=5s8qncdbso;lr=on>
Record-Route:
<sip:192.168.0.14:5061;transport=tls;r2=on;ftag=5s8qncdbso;lr=on>
Record-Route: <sip:192.168.0.14;transport=tcp;r2=on;ftag=5s8qncdbso;lr=on>
From: "Alice" <sip:alice@atlanta.com>;tag=5s8qncdbso
To: <sip:bob@biloxi.com>;tag=fxdufnc4xz
Call-ID: 3c2675cac832-ce5ge5sxlx2q@snom360
CSeq: 1 INVITE
Contact: <sip:bob@192.168.1.1:2063;transport=tcp;line=wxqurd1s>
Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE,
PRACK, MESSAGE, INFO
Allow-Events: talk, hold, refer
Content-Length: 0

Sent to tcp:192.168.1.14:5060 at 15/10/2005 19:18:33:390 (1377 bytes):

SIP/2.0 200 Ok
Via: SIP/2.0/TCP 192.168.1.14;branch=z9hG4bKcad9.057cd815.0;i=d
Via: SIP/2.0/TLS 192.168.0.14:5061;branch=z9hG4bKcad9.685be3c3.0;i=1
Via: SIP/2.0/TCP
172.16.0.4:2327;received=192.168.0.13;branch=z9hG4bK-y79imu6dlqxs;rport=2327
Record-Route: <sip:192.168.1.14;transport=tcp;r2=on;ftag=5s8qncdbso;lr=on>
Record-Route:
<sip:192.168.1.14:5061;transport=tls;r2=on;ftag=5s8qncdbso;lr=on>
Record-Route:
<sip:192.168.0.14:5061;transport=tls;r2=on;ftag=5s8qncdbso;lr=on>
Record-Route: <sip:192.168.0.14;transport=tcp;r2=on;ftag=5s8qncdbso;lr=on>
From: "Alice" <sip:alice@atlanta.com>;tag=5s8qncdbso
To: <sip:bob@biloxi.com>;tag=fxdufnc4xz
Call-ID: 3c2675cac832-ce5ge5sxlx2q@snom360
CSeq: 1 INVITE
Contact: <sip:bob@192.168.1.1:2063;transport=tcp;line=wxqurd1s>
Require: timer
Session-Expires: 3600;refresher=uac
User-Agent: snom360/4.3
Allow: INVITE, ACK, CANCEL, BYE, REFER, OPTIONS, NOTIFY, SUBSCRIBE,
PRACK, MESSAGE, INFO
Allow-Events: talk, hold, refer
Supported: timer, 100rel, replaces, callerid
Content-Type: application/sdp
Content-Length: 296

ACK sip:bob@192.168.1.1:2063;transport=tcp;line=wxqurd1s SIP/2.0
Record-Route: <sip:192.168.1.14;transport=tcp;r2=on;ftag=5s8qncdbso;lr=on>
Record-Route:
<sip:192.168.1.14:5061;transport=tls;r2=on;ftag=5s8qncdbso;lr=on>
Record-Route:
<sip:192.168.0.14:5061;transport=tls;r2=on;ftag=5s8qncdbso;lr=on>
Record-Route: <sip:192.168.0.14;transport=tcp;r2=on;ftag=5s8qncdbso;lr=on>
Via: SIP/2.0/TCP 192.168.1.14;branch=0;i=d
Via: SIP/2.0/TLS 192.168.0.14:5061;branch=0;i=1
Via: SIP/2.0/TCP
172.16.0.4:2327;received=192.168.0.13;branch=z9hG4bK-o9f1lglhf4pk;rport=2327
From: "Alice" <sip:alice@atlanta.com>;tag=5s8qncdbso
To: <sip:bob@biloxi.com>;tag=fxdufnc4xz
Call-ID: 3c2675cac832-ce5ge5sxlx2q@snom360
CSeq: 1 ACK
Max-Forwards: 68
Contact: <sip:alice@172.16.0.4:2327;transport=tcp;line=fyyuh6tl>
Content-Length: 0
P-hint: rr-enforced
P-hint: rr-enforced

Sent to tcp:192.168.1.14:5060 at 15/10/2005 19:18:34:480 (703 bytes):

BYE sip:alice@172.16.0.4:2327;transport=tcp;line=fyyuh6tl SIP/2.0
Via: SIP/2.0/TCP 192.168.1.1:2063;branch=z9hG4bK-gu03sll9uumm;rport
Route: <sip:192.168.1.14;transport=tcp;r2=on;ftag=5s8qncdbso;lr=on>
Route: <sip:192.168.1.14:5061;transport=tls;r2=on;ftag=5s8qncdbso;lr=on>
Route: <sip:192.168.0.14:5061;transport=tls;r2=on;ftag=5s8qncdbso;lr=on>
Route: <sip:192.168.0.14;transport=tcp;r2=on;ftag=5s8qncdbso;lr=on>
From: <sip:bob@biloxi.com>;tag=fxdufnc4xz
To: "Alice" < sip:alice@atlanta.com>;tag=5s8qncdbso
Call-ID: 3c2675cac832-ce5ge5sxlx2q@snom360
CSeq: 1 BYE
Max-Forwards: 70
Contact: <sip:bob@192.168.1.1:2063;transport=tcp;line=wxqurd1s>
User-Agent: snom360/4.3
Content-Length: 0

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