[Serusers] User Agent Behind Nat is not sending ACK! Help, Please!
armando
armandom at ctitelnet.com
Thu Sep 30 20:51:22 CEST 2004
Hi!
I have a very weird trouble here... I've been watching using a sniffer the
messages exchange between 2 UA and SER .... and I can see very clear that
the Caller UA never reply with an ACK message after it has received the 200
OK message from the Callee UA. It just open the rtp port and start sending
out rtp streams... I have tried this either using ATA and Sipuras, but
always the same result... because of this the caller never received audio
streams from the callee due this last one is waiting for the ACK message
after it sent out the 200 OK message... I have no clue why they are no
sending this message to the callee.. I need help please!!!
Any help or clue or hint...or whatever will be really appreciate!!!
Thanks in advance!
Armando Marrero
Cti, Miami, FL
Here is a Copy of a ngrep session. This ngrep session is in the attached
file too.
Bob using Real IP , Armando Private IP behind NAT.... rtpproxy is enforced.
Call 1 = From Bob -> Armando = Success
Call 2 = From Armando -> Bob = Failed because Armando UA never reply with
ACK after 200 Ok Message
############
Call 1 caller: Bob , Callee : Armando.... Successfull Call Setup
U Armando -> SER
SIP/2.0 200 OK..Via: SIP/2.0/UDP 10.1.90.116;branch=z9hG4bK1ba9.f6fe0847.0
.Via: SIP/2.0/UDP 66.231.238.215:5060..Record-
Route: <sip:3056034425 at 10.1.90.116;ftag=1564176202;lr=on>..From:
<sip:1234 at 10.1.90.116;user=phone>;tag=1564176202..To: <s
ip:3056034425 at 10.1.90.116;user=phone>;tag=642782702..Call-ID:
2352639743 at 66.231.238.215..CSeq: 1 INVITE..Contact: <sip:30
56034425 at 192.168.0.103:5061;user=phone;transport=udp>..Server: Cisco ATA
186 v2.16 ata18x (030509a)..Content-Length: 203
..Content-Type: application/sdp....v=0..o=3056034425 62077 62077 IN IP4
192.168.0.103..s=ATA186 Call..c=IN IP4 192.168.0.
103..t=0 0..m=audio 16384 RTP/AVP 0 101..a=rtpmap:0 PCMU/8000/1.
a=rtpmap:101 telephone-event/8000..a=fmtp:101 0-15..
#
U SER -> Bob
SIP/2.0 200 OK..Via: SIP/2.0/UDP 66.231.238.215:5060..Record-Route:
<sip:3056034425 at 10.1.90.116;ftag=1564176202;lr=on>..F
rom: <sip:1234 at 10.1.90.116;user=phone>;tag=1564176202..To:
<sip:3056034425 at 10.1.90.116;user=phone>;tag=642782702..Call-ID
: 2352639743 at 66.231.238.215..CSeq: 1 INVITE..Contact: <sip:3056034425 at 66
176.127.120:5061;user=phone;transport=udp>..Serv
er: Cisco ATA 186 v2.16 ata18x (030509a)..Content-Length: 242.
Content-Type: application/sdp....v=0..o=3056034425 62077
62077 IN IP4 192.168.0.103..s=ATA186 Call..c=IN IP4 66.231.238.115..t=0 0.
m=audio 35118 RTP/AVP 0 101..a=rtpmap:0 PCMU/8
000/1..a=rtpmap:101 telephone-event/8000..a=fmtp:101 0-15.
a=direction:active..a=nortpproxy:yes..
#
U Bob -> SER
ACK sip:3056034425 at 10.1.90.116 SIP/2.0..Route: <sip:3056034425 at 66.176.127
120:5061;user=phone;transport=udp>..Via: SIP/2.
0/UDP 66.231.238.215:5060..From: <sip:1234 at 10.1.90.116;user=phone>
tag=1564176202..To: <sip:3056034425 at 10.1.90.116;user=p
hone>;tag=642782702..Call-ID: 2352639743 at 66.231.238.215..CSeq: 1 ACK.
User-Agent: Cisco ATA 186 v2.15 ata18x (030313a)..
Content-Length: 0....
#
U SER -> Armando
ACK sip:3056034425 at 66.176.127.120:5061;user=phone;transport=udp SIP/2.0.
Max-Forwards: 10..Record-Route: <sip:3056034425@
10.1.90.116;ftag=1564176202;lr=on>..Via: SIP/2.0/UDP 10.1.90.116;branch=0.
Via: SIP/2.0/UDP 66.231.238.215:5060..From: <s
ip:1234 at 10.1.90.116;user=phone>;tag=1564176202..To: <sip:3056034425 at 10.1
90.116;user=phone>;tag=642782702..Call-ID: 23526
39743 at 66.231.238.215..CSeq: 1 ACK..User-Agent: Cisco ATA 186 v2.15 ata18x
(030313a)..Content-Length: 0....
##################
Call 2 caller: Armando , Callee : Bob.... Failed Call Setup ....
U Bob -> SER
SIP/2.0 200 OK..Via: SIP/2.0/UDP 10.1.90.116;branch=z9hG4bK4544.49cf0507.0
.Via: SIP/2.0/UDP 192.168.0.103:5061;received=
66.176.127.120..Record-Route: <sip:1234 at 10.1.90.116;ftag=298050148;lr=on>.
From: <sip:3056034425 at lserver.telecode.com;use
r=phone>;tag=298050148..To: <sip:1234 at lserver.telecode.com;user=phone>
tag=1758946682..Call-ID: 2670895917 at 192.168.0.103.
.CSeq: 1 INVITE..Contact: <sip:1234 at 66.231.238.215:5060;user=phone
transport=udp>..Server: Cisco ATA 186 v2.15 ata18x (0
30313a)..Content-Length: 197..Content-Type: application/sdp....v=0..o=1234
1415 1415 IN IP4 66.231.238.215..s=ATA186 Call
..c=IN IP4 66.231.238.215..t=0 0..m=audio 16384 RTP/AVP 0 101..a=rtpmap:0
PCMU/8000/1..a=rtpmap:101 telephone-event/8000.
.a=fmtp:101 0-15..
#
U SER -> Armando
SIP/2.0 200 OK..Via: SIP/2.0/UDP 192.168.0.103:5061;received=66.176.127
120..Record-Route: <sip:1234 at 10.1.90.116;ftag=298
050148;lr=on>..From: <sip:3056034425 at lserver.telecode.com;user=phone>
tag=298050148..To: <sip:1234 at lserver.telecode.com;u
ser=phone>;tag=1758946682..Call-ID: 2670895917 at 192.168.0.103..CSeq: 1
INVITE..Contact: <sip:1234 at 66.231.238.215:5060;user
=phone;transport=udp>..Server: Cisco ATA 186 v2.15 ata18x (030313a).
Content-Length: 235..Content-Type: application/sdp.
...v=0..o=1234 1415 1415 IN IP4 66.231.238.215..s=ATA186 Call..c=IN IP4 66
231.238.115..t=0 0..m=audio 35122 RTP/AVP 0 10
1..a=rtpmap:0 PCMU/8000/1..a=rtpmap:101 telephone-event/8000..a=fmtp:101
0-15..a=direction:active..a=nortpproxy:yes..
#
------ no ACK send back....in this moment Armando UA just open rtp and start
sending voice streams
------ Bob User Agent resend this several times , but never get ACK message
from Armando UA
U Bob -> SER
SIP/2.0 200 OK..Via: SIP/2.0/UDP 10.1.90.116;branch=z9hG4bK4544.49cf0507.0
.Via: SIP/2.0/UDP 192.168.0.103:5061;received=
66.176.127.120..Record-Route: <sip:1234 at 10.1.90.116;ftag=298050148;lr=on>.
From: <sip:3056034425 at lserver.telecode.com;use
r=phone>;tag=298050148..To: <sip:1234 at lserver.telecode.com;user=phone>
tag=1758946682..Call-ID: 2670895917 at 192.168.0.103.
.CSeq: 1 INVITE..Contact: <sip:1234 at 66.231.238.215:5060;user=phone
transport=udp>..Server: Cisco ATA 186 v2.15 ata18x (0
30313a)..Content-Length: 197..Content-Type: application/sdp....v=0..o=1234
1415 1415 IN IP4 66.231.238.215..s=ATA186 Call
..c=IN IP4 66.231.238.215..t=0 0..m=audio 16384 RTP/AVP 0 101..a=rtpmap:0
PCMU/8000/1..a=rtpmap:101 telephone-event/8000.
.a=fmtp:101 0-15..
#
U SER -> Armando
SIP/2.0 200 OK..Via: SIP/2.0/UDP 192.168.0.103:5061;received=66.176.127
120..Record-Route: <sip:1234 at 10.1.90.116;ftag=298
050148;lr=on>..From: <sip:3056034425 at lserver.telecode.com;user=phone>
tag=298050148..To: <sip:1234 at lserver.telecode.com;u
ser=phone>;tag=1758946682..Call-ID: 2670895917 at 192.168.0.103..CSeq: 1
INVITE..Contact: <sip:1234 at 66.231.238.215:5060;user
=phone;transport=udp>..Server: Cisco ATA 186 v2.15 ata18x (030313a).
Content-Length: 235..Content-Type: application/sdp.
...v=0..o=1234 1415 1415 IN IP4 66.231.238.215..s=ATA186 Call..c=IN IP4 66
231.238.115..t=0 0..m=audio 35122 RTP/AVP 0 10
1..a=rtpmap:0 PCMU/8000/1..a=rtpmap:101 telephone-event/8000..a=fmtp:101
0-15..a=direction:active..a=nortpproxy:yes..
#
U Bob -> SER
SIP/2.0 200 OK..Via: SIP/2.0/UDP 10.1.90.116;branch=z9hG4bK4544.49cf0507.0
.Via: SIP/2.0/UDP 192.168.0.103:5061;received=
138,3 56%
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