[Serusers] Incorrect RTP Audio Path?! (no NAT involved!)

[Jamie Yukes]

INVITE, 100, 183 look good
but then the ringing RTP audio is sent to SER/proxy server instead of
our media server!
The SDP looks accurate... any ideas?
Jamie Yukes

----------------------------------------------------------------------
ngrep call trace
64.158.AAA.AAA is our media server
64.158.BBB.BBB is our proxy server ( SER )
209.247.CCC.CCC is far end proxy server
209.247.DDD.DDD is far end media server
-----------------------------------------------------------------------

interface: any
filter: ip and ( port 5060 or port 5070 or port 30000 or port 30036 )
#
U 64.158.AAA.AAA:5060 -> 64.158.BBB.BBB:5060
INVITE sip:609XXXXXXX at 64.158.BBB.BBB:5060 SIP/2.0.
Via: SIP/2.0/UDP 64.158.AAA.AAA:5060.
From: "609YYYYYYY"
<sip:609YYYYYYY at 64.158.AAA.AAA:5060;user=phone>;tag=L9-a4857c4577b880bf.
To: <sip:609XXXXXXX at 64.158.BBB.BBB:5060;user=phone>.
Call-ID: L9-C8-424dd29dd3cf142d at 64.158.AAA.AAA.
CSeq: 1 INVITE.
Contact: "609YYYYYYY" <sip:609YYYYYYY at 64.158.AAA.AAA:5060;user=phone>.
Max-Forwards: 10.
User-Agent: ZZZ Gateway.
Content-Type: application/sdp.
Content-Length: 189.
.
v=0.
o=609YYYYYYY 0 0 IN IP4 64.158.AAA.AAA.
s=SIP Call.
c=IN IP4 64.158.AAA.AAA.
t=0 0.
m=audio 30036 RTP/AVP 0 121.
a=rtpmap:0 PCMU/8000.
a=rtpmap:121 frf-dialed-digit/8000.
a=fmtp:121 0-15.

#
U 64.158.BBB.BBB:5060 -> 64.158.AAA.AAA:5060
SIP/2.0 100 trying -- your call is important to us.
Via: SIP/2.0/UDP 64.158.AAA.AAA:5060.
From: "609YYYYYYY"
<sip:609YYYYYYY at 64.158.AAA.AAA:5060;user=phone>;tag=L9-a4857c4577b880bf.
To: <sip:609XXXXXXX at 64.158.BBB.BBB:5060;user=phone>.
Call-ID: L9-C8-424dd29dd3cf142d at 64.158.AAA.AAA.
CSeq: 1 INVITE.
Server: Sip EXpress router (0.8.12 (i386/linux)).
Content-Length: 0.
Warning: 392 64.158.BBB.BBB:5060 "Noisy feedback tells:  pid=21192
req_src_ip=64.158.AAA.AAA req_src_port=5060
in_uri=sip:609XXXXXXX at 64.158.BBB.BBB:5060
out_uri=sip:+1609XXXXXXX at 209.247.CCC.CCC:5060 via_cnt==1".
.

#
U 64.158.BBB.BBB:5060 -> 209.247.CCC.CCC:5060
INVITE sip:+1609XXXXXXX at 209.247.CCC.CCC:5060 SIP/2.0.
Record-Route: <sip:609XXXXXXX at 64.158.BBB.BBB;ftag=L9-a4857c4577b880bf;lr>.
Via: SIP/2.0/UDP 64.158.BBB.BBB;branch=z9hG4bKfbcc.e26d4cc7.0.
Via: SIP/2.0/UDP 64.158.AAA.AAA:5060.
From: <sip:+1609YYYYYYY at 64.158.AAA.AAA:5060;user=phone>;tag=L9-a4857c4577b880bf.
To: <sip:+1609XXXXXXX at 64.158.AAA.AAA:5060;user=phone>.
Call-ID: L9-C8-424dd29dd3cf142d at 64.158.AAA.AAA.
CSeq: 1 INVITE.
Contact: <sip:+1609YYYYYYY at 64.158.AAA.AAA:5060;user=phone>.
Max-Forwards: 9 .
User-Agent: ZZZ Gateway.
Content-Type: application/sdp.
Content-Length: 189.
P-to: updated to e164.
P-from: updated to e164.
P-contact: updated to e164.
.
v=0.
o=609YYYYYYY 0 0 IN IP4 64.158.AAA.AAA.
s=SIP Call.
c=IN IP4 64.158.AAA.AAA.
t=0 0.
m=audio 30036 RTP/AVP 0 121.
a=rtpmap:0 PCMU/8000.
a=rtpmap:121 frf-dialed-digit/8000.
a=fmtp:121 0-15.

#
U 209.247.CCC.CCC:44660 -> 64.158.BBB.BBB:5060
SIP/2.0 100 Trying.
Via: SIP/2.0/UDP
64.158.BBB.BBB:5060;branch=z9hG4bKfbcc.e26d4cc7.0,SIP/2.0/UDP
64.158.AAA.AAA:5060.
From: <sip:+1609YYYYYYY at 64.158.AAA.AAA:5060;user=phone>;tag=L9-a4857c4577b880bf.
To: <sip:+1609XXXXXXX at 64.158.AAA.AAA:5060;user=phone>.
Call-ID: L9-C8-424dd29dd3cf142d at 64.158.AAA.AAA.
CSeq: 1 INVITE.
Content-Length: 0.
.

#
U 209.247.CCC.CCC:44660 -> 64.158.BBB.BBB:5060
SIP/2.0 183 Session Progress.
Via: SIP/2.0/UDP
64.158.BBB.BBB:5060;branch=z9hG4bKfbcc.e26d4cc7.0,SIP/2.0/UDP
64.158.AAA.AAA:5060.
Record-Route: <sip:609XXXXXXX at 64.158.BBB.BBB;ftag=L9-a4857c4577b880bf;lr>.
From: <sip:+1609YYYYYYY at 64.158.AAA.AAA:5060;user=phone>;tag=L9-a4857c4577b880bf.
To: <sip:+1609XXXXXXX at 64.158.AAA.AAA:5060;user=phone>;tag=VPST50603522629633.
Call-ID: L9-C8-424dd29dd3cf142d at 64.158.AAA.AAA.
CSeq: 1 INVITE.
Contact: <sip:209.247.CCC.CCC:5060;transport=udp>.
Content-Type: application/sdp.
Content-Length: 124.
.
v=0.
o=- 1087411692 1087411693 IN IP4 209.247.DDD.DDD.
s=-.
c=IN IP4 209.247.DDD.DDD.
t=0 0.
m=audio 60590 RTP/AVP 0.
a=ptime:20.

#
U 64.158.BBB.BBB:5060 -> 64.158.AAA.AAA:5060
SIP/2.0 183 Session Progress.
Via: SIP/2.0/UDP 64.158.AAA.AAA:5060.
Record-Route: <sip:609XXXXXXX at 64.158.BBB.BBB;ftag=L9-a4857c4577b880bf;lr>.
From: <sip:+1609YYYYYYY at 64.158.AAA.AAA:5060;user=phone>;tag=L9-a4857c4577b880bf.
To: <sip:+1609XXXXXXX at 64.158.AAA.AAA:5060;user=phone>;tag=VPST50603522629633.
Call-ID: L9-C8-424dd29dd3cf142d at 64.158.AAA.AAA.
CSeq: 1 INVITE.
Contact: <sip:209.247.CCC.CCC:5060;transport=udp>.
Content-Type: application/sdp.
Content-Length: 124.
.
v=0.
o=- 1087411692 1087411693 IN IP4 209.247.DDD.DDD.
s=-.
c=IN IP4 209.247.DDD.DDD.
t=0 0.
m=audio 60590 RTP/AVP 0.
a=ptime:20.

#
U 209.247.DDD.DDD:60590 -> 64.158.BBB.BBB:30036
....>*..
..a....._B83238BZ.........O@<9;<FV.........cQJHGKQ\w........}rpu~....xi^YTTW]q.........WJB?>AHZ.........VB:658;Is........bB8///3=T.........F7/+,.6F.........Q:/,+,0
#
U 209.247.DDD.DDD:60590 -> 64.158.BBB.BBB:30036
....>*.o
..a=^........o at 3-+,09L.........K:0-..7Dy........_B93038B\.........O@<9;=FV.........cPJHGKP\u........|qqu~....xi]XTTV]p.........VKB?>AHY.........VB:657;Is........aC
#
U 209.247.DDD.DDD:60590 -> 64.158.BBB.BBB:30036
....>*..
..a.i..8///3=T.........F7/,,.6F.........R:/,+,0=^........s?3-*-08J.........L:1-./7Cw........_C92038BZ.........OA<9;=GU.........cRJHGKP]t........|qpv.....xi]XTRW\p.....
#