[SR-Users] Re-invite problems with t.38?
Espen Berg
espen at monsternett.no
Sat Apr 17 21:39:29 CEST 2010
Den 15.04.2010 13:27, skrev Klaus Darilion:
>> How would you have written it?
>
> I prefer this logic:
>
> ...
> if (loose_route()) {
> if (!has_totag()) {
> xlog("L_WARN","$ci loose_route request without to-tag, 403...\n");
> sl_send_reply("403", "out-of-dialog loose_route not allowed");
> exit;
> }
> ... loose..route..processing
> ... NAT traversal...rtpproxy....
> t_relay();
> }
> ...
> initial call setup ...
> ...
Nice :)
>>> Trace the scenario with ngrep and take a look at the SDPs if they are
>>> rewritten properly.
>>
>> I'm not able to spot any errors, the only error I'm able to see is that
>> it seems to work one way.
>>
>> If A sends a fax to B
>>
>> This works with T.38:
>> asterisk A <-> sipprovider <-> our trunk <-> kamailio/rtpp <-> asterisk
>> <-> asterisk B (our asterisk)
>>
>> This fails with T.38, but works with G.711:
>> asterisk B -> asterisk -> kamailio/rtpp -> our trunk -> asterisk ->
>> asterisk A
>>
>> Could also be an Asterisk (A: 1.6.2.5/tested with 1.6.2.7rc, B: 1.6.2.6)
>> or FFA bug. But if I try to send the FAX directly via SIP from A <-> B
>> without the proxy everything works OK, so therefore I believe the
>> problem are related to my kamailio configuration.
>
> Post the ngrep dump of the 2 different processes.
I have been debugging this problem little bit more. The re-invite test
showed precisely the same with x-lite on hold as
with t.38 re-invite.
If I call out and place a call on hold, I'm able to continue the call
for about 20 seconds until the call was aborted. If
I call into the same extension there are no problems to continue the
call after "on hold". So just as the fax, the problem
only occurs for outgoing calls, not inbound. I also tested with a
cellular phone, just to eliminate the other end.
Here are some ncat captures of the t.38 scenario that fails.
ASTERISK B:
#############################################################################################################################$
U PUBLIC-IP-TO-PROXY:5060 -> IP-TO-ASTERISK:5060
INVITE sip:FAXNUMBER at IP-TO-ASTERISK:5060 SIP/2.0..Via: SIP/2.0/UDP
PUBLIC-IP-TO-PROXY;branch=z9hG4bK61a.7e6809b3.0..Vi
a: SIP/2.0/UDP
IP-TO-SONUS-TRUNK:5060;branch=z9hG4bK02B5afc10d34f983f6e..From:
<sip:SENDTONUMBER at PUBLIC-IP-TO-PROXY>;tag=gK02b1
6fe7..To: "FAX"
<sip:FAXNUMBER at PUBLIC-IP-TO-PROXY>;tag=as56fa57a3..Call-ID:
15180894487146a33b3f3bac366bc0bb at PUBLIC-IP-TO-PROXY
..CSeq: 17055 INVITE..Max-Forwards: 70..Allow:
INVITE,ACK,CANCEL,BYE,REFER,INFO,SUBSCRIBE,NOTIFY,PRACK,UPDAT
E,OPTIONS,MESSAGE,PUBLISH..Accept: application/sdp, application/isup,
application/dtmf, application/dtmf-relay,
multipart/mixed..Contact:
<sip:SENDTONUMBER at IP-TO-SONUS-TRUNK:5060>..Supported:
timer..Session-Expires: 1800;refresher=uas.
.Min-SE: 90..Content-Length: 323..Content-Disposition: session;
handling=required..Content-Type: application/sdp
....v=0..o=Sonus_UAC 23586 20272 IN IP4 IP-TO-SONUS-TRUNK..s=SIP
Media Capabilities..c=IN IP4 PUBLIC-IP-TO-PROXY..t=0 0..m=
image 35298 udptl
t38..a=T38FaxVersion:0..a=T38MaxBitRate:14400..a=T38FaxRateManagement:transferredTCF..a=T38FaxM
axBuffer:262..a=T38FaxMaxDatagram:176..a=T38FaxUdpEC:t38UDPRedundancy..a=sendrecv..a=nortpproxy:yes..
###
U IP-TO-ASTERISK:5060 -> PUBLIC-IP-TO-PROXY:5060
SIP/2.0 200 OK..Via: SIP/2.0/UDP
PUBLIC-IP-TO-PROXY;branch=z9hG4bK61a.7e6809b3.0;received=PUBLIC-IP-TO-PROXY..Via:
SIP/2.
0/UDP IP-TO-SONUS-TRUNK:5060;branch=z9hG4bK02B5afc10d34f983f6e..From:
<sip:SENDTONUMBER at PUBLIC-IP-TO-PROXY>;tag=gK02b16fe7..To:
"FAX" <sip:FAXNUMBER at PUBLIC-IP-TO-PROXY>;tag=as56fa57a3..Call-ID:
15180894487146a33b3f3bac366bc0bb at PUBLIC-IP-TO-PROXY..CS
eq: 17055 INVITE..Server: Asterisk PBX 1.6.2.6..Allow: INVITE, ACK,
CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIF
Y, INFO..Supported: replaces, timer..Require: timer..Session-Expires:
1800;refresher=uas..Contact: <sip:FAXNUMBER@
IP-TO-ASTERISK>..Content-Type: application/sdp..Content-Length:
276....v=0..o=root 1138957066 1138957067 IN IP4 IP-TO-ASTERISK
..s=Asterisk PBX 1.6.2.6..c=IN IP4 IP-TO-ASTERISK..t=0 0..m=image
4400 udptl t38..a=T38FaxVersion:0.
.a=T38MaxBitRate:14400..a=T38FaxRateManagement:transferredTCF..a=T38FaxMaxDatagram:1400..a=T38FaxUdpEC:t38UDPRedu
ndancy..
#############################################################################################################################$
KAMAILIO PROXY ETH0:
U PUBLIC-IP-TO-PROXY:5060 -> IP-TO-ASTERISK:5060
INVITE sip:FAXNUMBER at IP-TO-ASTERISK:5060 SIP/2.0..Via: SIP/2.0/UDP
PUBLIC-IP-TO-PROXY;branch=z9hG4bK6d41.d083efb2.0..Via: SIP/2.0/UDP
IP-TO-SONUS-TRUNK:5060;branch=z9hG4bK02B44d12570046e38f1..From:
<sip:SENDTONUMBER at PUBLIC-IP-TO-PROXY>;tag=gK02ec0fad.
.To: "FAX"
<sip:FAXNUMBER at PUBLIC-IP-TO-PROXY>;tag=as6196c897..Call-ID:
58b69aef10209bf30e38c5371ebb29cf at PUBLIC-IP-TO-PROXY..CSeq: 15775
INVITE..Max-Forwards: 70..Allow:
INVITE,ACK,CANCEL,BYE,REFER,INFO,SUBSCRIBE,NOTIFY,PRACK,UPDATE,OPTIONS,M
ESSAGE,PUBLISH..Accept: application/sdp, application/isup,
application/dtmf, application/dtmf-relay, multipart/mixed..Contact:
<sip:SENDTONUMBER at IP-TO-SONUS-TRUNK:5060>..Supported:
timer..Session-Expires: 1800;refresher=uas..Min-SE: 90..Cont
ent-Length: 322..Content-Disposition: session;
handling=required..Content-Type: application/sdp....v=0..o=Sonus_UAC
9775 15421 IN IP4 IP-TO-SONUS-TRUNK..s=SIP Media Capabilities..c=IN IP4
PUBLIC-IP-TO-PROXY..t=0 0..m=image 35292 udptl t38..a
=T38FaxVersion:0..a=T38MaxBitRate:14400..a=T38FaxRateManagement:transferredTCF..a=T38FaxMaxBuffer:262..a=T38FaxMaxDatagram:176..a=T38FaxUdpEC:t38UDPRedundancy..a=sendrecv..a=nortpproxy:yes..
###
U IP-TO-ASTERISK:5060 -> PUBLIC-IP-TO-PROXY:5060
SIP/2.0 200 OK..Via: SIP/2.0/UDP
PUBLIC-IP-TO-PROXY;branch=z9hG4bK6d41.d083efb2.0;received=PUBLIC-IP-TO-PROXY..Via:
SIP/2.0/UDP
IP-TO-SONUS-TRUNK:5060;branch=z9hG4bK02B44d12570046e38f1..From:
<sip:SENDTONUMBER at PUBLIC-IP-TO-PROXY>;tag=gK02ec0fad..To: "FAX
" <sip:FAXNUMBER at PUBLIC-IP-TO-PROXY>;tag=as6196c897..Call-ID:
58b69aef10209bf30e38c5371ebb29cf at PUBLIC-IP-TO-PROXY..CSeq: 15775
INVITE..Server: Asterisk PBX 1.6.2.6..Allow: INVITE, ACK, CANCEL,
OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO..Su
pported: replaces, timer..Require: timer..Session-Expires:
1800;refresher=uas..Contact:
<sip:FAXNUMBER at IP-TO-ASTERISK>..Content-Type:
application/sdp..Content-Length: 276....v=0..o=root 1675681328
1675681329 IN IP4 IP-TO-ASTERISK..s=
Asterisk PBX 1.6.2.6..c=IN IP4 IP-TO-ASTERISK..t=0 0..m=image 4852
udptl
t38..a=T38FaxVersion:0..a=T38MaxBitRate:14400..a=T38FaxRateManagement:transferredTCF..a=T38FaxMaxDatagram:1400..a=T38FaxUdpEC:t38UDPRedundancy..
KAMAILIO PROXY ETH1:
U IP-TO-SONUS-TRUNK:5060 -> LOCAL-IP-TO-PROXY:5060
INVITE sip:FAXNUMBER at IP-TO-ASTERISK:5060 SIP/2.0..Via: SIP/2.0/UDP
IP-TO-SONUS-TRUNK:5060;branch=z9hG4bK02B48cc1116e608d4ed..From:
<sip:SENDTONUMBER at PUBLIC-IP-TO-PROXY>;tag=gK02f86d27..To: "FAX"
<sip:FAXNUMBER at PUBLIC-IP-TO-PROXY>;tag=as279d4a05..Call-I
D: 101766785455b9020d350d300cb15082 at PUBLIC-IP-TO-PROXY..CSeq: 24873
INVITE..Max-Forwards: 70..Allow:
INVITE,ACK,CANCEL,BYE,REFER,INFO,SUBSCRIBE,NOTIFY,PRACK,UPDATE,OPTIONS,MESSAGE,PUBLISH..Accept:
application/sdp, application/isup, appl
ication/dtmf, application/dtmf-relay, multipart/mixed..Contact:
<sip:SENDTONUMBER at IP-TO-SONUS-TRUNK:5060>..Route:
<sip:LOCAL-IP-TO-PROXY:5060;r2=on;lr;ftag=as279d4a05>..Route:
<sip:PUBLIC-IP-TO-PROXY:5060;r2=on;lr;ftag=as279d4a05>..Supported: timer..
Session-Expires: 1800;refresher=uas..Min-SE: 90..Content-Length:
301..Content-Disposition: session; handling=required..Content-Type:
application/sdp....v=0..o=Sonus_UAC 18853 20363 IN IP4
IP-TO-SONUS-TRUNK..s=SIP Media Capabilities..c=IN
IP4 RTP-IP-TO-SONUSTRUNK..t=0 0..m=image 7994 udptl
t38..a=T38FaxVersion:0..a=T38MaxBitRate:14400..a=T38FaxRateManagement:transferredTCF..a=T38FaxMaxBuffer:262..a=T38FaxMaxDatagram:176..a=T38FaxUdpEC:t38UDPRedundancy..a=sendrecv..
####
U LOCAL-IP-TO-PROXY:5060 -> IP-TO-SONUS-TRUNK:5060
SIP/2.0 200 OK..Via: SIP/2.0/UDP
IP-TO-SONUS-TRUNK:5060;branch=z9hG4bK02B48cc1116e608d4ed..From:
<sip:SENDTONUMBER at PUBLIC-IP-TO-PROXY>;tag=gK02f86d27..To: "FAX"
<sip:FAXNUMBER at PUBLIC-IP-TO-PROXY>;tag=as279d4a05..Call-ID:
101766785455b9020d350d300cb150
82 at PUBLIC-IP-TO-PROXY..CSeq: 24873 INVITE..Server: Asterisk PBX
1.6.2.6..Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE,
NOTIFY, INFO..Supported: replaces, timer..Require:
timer..Session-Expires: 1800;refresher=uas..Contact:
<sip:FAXNUMBER at IP-TO-ASTERISK>..Content-Type:
application/sdp..Content-Length: 293....v=0..o=root 1135418376
1135418377 IN IP4 IP-TO-ASTERISK..s=Asterisk PBX 1.6.2.6..c=IN IP4
LOCAL-IP-TO-PROXY..t=0 0..m=image 35324 udptl t38..a=T38FaxVe
rsion:0..a=T38MaxBitRate:14400..a=T38FaxRateManagement:transferredTCF..a=T38FaxMaxDatagram:1400..a=T38FaxUdpEC:t38UDPRedundancy..a=nortpproxy:yes..
U IP-TO-SONUS-TRUNK:5060 -> LOCAL-IP-TO-PROXY:5060
INVITE sip:FAXNUMBER at IP-TO-ASTERISK:5060 SIP/2.0..Via: SIP/2.0/UDP
IP-TO-SONUS-TRUNK:5060;branch=z9hG4bK02B48cc1116e608d4ed..From:
<sip:SENDTONUMBER at PUBLIC-IP-TO-PROXY>;tag=gK02f86d27..To: "FAX"
<sip:FAXNUMBER at PUBLIC-IP-TO-PROXY>;tag=as279d4a05..Call-I
D: 101766785455b9020d350d300cb15082 at PUBLIC-IP-TO-PROXY..CSeq: 24873
INVITE..Max-Forwards: 70..Allow:
INVITE,ACK,CANCEL,BYE,REFER,INFO,SUBSCRIBE,NOTIFY,PRACK,UPDATE,OPTIONS,MESSAGE,PUBLISH..Accept:
application/sdp, application/isup, appl
ication/dtmf, application/dtmf-relay, multipart/mixed..Contact:
<sip:SENDTONUMBER at IP-TO-SONUS-TRUNK:5060>..Route:
<sip:LOCAL-IP-TO-PROXY:5060;r2=on;lr;ftag=as279d4a05>..Route:
<sip:PUBLIC-IP-TO-PROXY:5060;r2=on;lr;ftag=as279d4a05>..Supported: timer..
Session-Expires: 1800;refresher=uas..Min-SE: 90..Content-Length:
301..Content-Disposition: session; handling=required..Content-Type:
application/sdp....v=0..o=Sonus_UAC 18853 20363 IN IP4
IP-TO-SONUS-TRUNK..s=SIP Media Capabilities..c=IN
IP4 RTP-IP-TO-SONUSTRUNK..t=0 0..m=image 7994 udptl
t38..a=T38FaxVersion:0..a=T38MaxBitRate:14400..a=T38FaxRateManagement:transferredTCF..a=T38FaxMaxBuffer:262..a=T38FaxMaxDatagram:176..a=T38FaxUdpEC:t38UDPRedundancy..a=sendrecv..
####
U LOCAL-IP-TO-PROXY:5060 -> IP-TO-SONUS-TRUNK:5060
SIP/2.0 200 OK..Via: SIP/2.0/UDP
IP-TO-SONUS-TRUNK:5060;branch=z9hG4bK02B48cc1116e608d4ed..From:
<sip:SENDTONUMBER at PUBLIC-IP-TO-PROXY>;tag=gK02f86d27..To: "FAX"
<sip:FAXNUMBER at PUBLIC-IP-TO-PROXY>;tag=as279d4a05..Call-ID:
101766785455b9020d350d300cb150
82 at PUBLIC-IP-TO-PROXY..CSeq: 24873 INVITE..Server: Asterisk PBX
1.6.2.6..Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE,
NOTIFY, INFO..Supported: replaces, timer..Require:
timer..Session-Expires: 1800;refresher=uas..Contact:
<sip:FAXNUMBER at IP-TO-ASTERISK>..Content-Type:
application/sdp..Content-Length: 293....v=0..o=root 1135418376
1135418377 IN IP4 IP-TO-ASTERISK..s=Asterisk PBX 1.6.2.6..c=IN IP4
LOCAL-IP-TO-PROXY..t=0 0..m=image 35324 udptl t38..a=T38FaxVe
rsion:0..a=T38MaxBitRate:14400..a=T38FaxRateManagement:transferredTCF..a=T38FaxMaxDatagram:1400..a=T38FaxUdpEC:t38UDPRedundancy..a=nortpproxy:yes..
ASTERISK A:
(REMOTE TESTSITE CONNECTED TO PHONZO, ONE PROVIDER KNOWN TO PROVIDE
FUNCTIONING T.38 SERVICES)
########################
U ASTERISK-TESTSITE-IP:5060 -> 80.232.37.178:5060
INVITE sip:80.232.37.178:5061 SIP/2.0..Via: SIP/2.0/UDP
85.165.146.221:5060;branch=z9hG4bK7726391b;rport..Route: <sip:80.232.37
.178;ftag=b1ae9fe1eb7f13837782c9061d653c57;lr>..Max-Forwards:
70..From: <sip:47SENDTONUMBER at 80.232.37.178>;tag=as61e4a63c..To: 6970
8347
<sip:FAXNUMBER at 80.232.37.178>;tag=b1ae9fe1eb7f13837782c9061d653c57..Contact:
<sip:SENDTONUMBER at 85.165.146.221>..Call-ID: 3D1965
63-47C711DF-AC2A9E0C-AB1DB137 at 80.232.37.179..CSeq: 102
INVITE..User-Agent: none..Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFE
R, SUBSCRIBE, NOTIFY, INFO..Supported: replaces, timer..Content-Type:
application/sdp..Content-Length: 268....v=0..o=root 10588
12562 1058812563 IN IP4 85.165.146.221..s=Asterisk PBX 1.6.2.5..c=IN
IP4 85.165.146.221..t=0 0..m=image 4810 udptl t38..a=T38Fa
xVersion:0..a=T38MaxBitRate:14400..a=T38FaxRateManagement:transferredTCF..a=T38FaxMaxDatagram:849..a=T38FaxUdpEC:t38UDPFEC..
######
U 80.232.37.178:5060 -> ASTERISK-TESTSITE-IP:5060
SIP/2.0 200 OK..Via: SIP/2.0/UDP
85.165.146.221:5060;branch=z9hG4bK7726391b;rport=5060..Record-Route:
<sip:80.232.37.178;ftag=a
s61e4a63c;lr>..From:
<sip:47SENDTONUMBER at 80.232.37.178>;tag=as61e4a63c..To: FAXNUMBER
<sip:FAXNUMBER at 80.232.37.178>;tag=b1ae9fe1eb7f1
3837782c9061d653c57..Call-ID:
3D196563-47C711DF-AC2A9E0C-AB1DB137 at 80.232.37.179..CSeq: 102
INVITE..Server: Sippy..Contact: Anon
ymous <sip:80.232.37.178:5061>..Content-Length: 220..Content-Type:
application/sdp....v=0..o=Sippy 144528972 1 IN IP4 80.232.37
.178..s=SIP Call..t=0 0..m=image 17772 udptl t38..c=IN IP4
80.232.37.179..a=T38FaxVersion:0..a=T38MaxBitRate:14400..a=T38FaxRat
eManagement:transferredTCF..a=T38FaxMaxDatagram:72..
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