Bogdan,
There aren't any other entries in the log file which would indicate
something is wrong with the call. I have provided a summary of call/rtp
flow, code snippets for onreply_routes, and a sip trace below showing
where rtpproxy_answer (in the onreply_route) failed. When
rtpproxy_answer fails, the external media IP is sent to my internal
agent, which causes routing issues sending the RTP stream. I am using
RTPProxy bridging (ie and ei flags depending on the direction). Please
see my notes below and in the traces.
You can clearly see that on the 183 and 200, rtpproxy_answer isn't doing
it's job (I just wish I knew why).
Any and all help is greatly appreciated.
Thanks,
Seth
Outbound SIP Routing:
Internal Agent (172.16.1.103) -> OpenSIPS (172.16.1.2) 172.16.1.2 is
rewritten to xxx.yyy.115.19 -> External Gateway (xxx.yyy.109.229)
Outbound RTP Routing:
Internal Agent (172.16.1.103) -> RTPProxy (172.16.1.111) 172.16.1.111 is
rewritten to xxx.yyy.115.20 -> External Agent (xxx.yyy.109.231)
Inbound SIP Routing:
External Gateway (xxx.yyy.109.229) -> OpenSIPS (xxx.yyy.115.19)
xxx.yyy.115.19 is rewritten to 172.16.1.2 -> Internal Agent (172.16.1.103)
Inbound RTP Routing:
External Agent (xxx.yyy.109.231) -> RTPProxy (xxx.yyy.115.20)
xxx.yyy.115.20 is rewritten to 172.16.1.111 -> Internal Agent (172.16.1.103)
Here are snippets of my onreply_route blocks:
...
onreply_route[INBOUND]
{
#Handle rewriting critical IP addresses
route(REWRITE);
xlog("L_WARN", "\nCR -----> PR -----> CE $dlg_val(called) $ci $cs
$rm $rs $rr onreply_route[INBOUND]");
if (!t_was_cancelled() && has_body("application/sdp"))
{
#Enable RTPProxy with internal->external flags
if (!rtpproxy_answer("ieor"))
{
xlog("L_ERR", "\nieor UNABLE TO NEGOTIATE MEDIA
$dlg_val(called) $ci $cs $rm $rs $rr $rd route[INBOUND]");
}
}
exit;
}
...
onreply_route[OUTBOUND]
{
#Handle rewriting critical IP addresses
route(REWRITE);
xlog("L_WARN", "\nCR <----- PR <----- CE $dlg_val(called) $ci $cs
$rm $rs $rr onreply_route[OUTBOUND]");
if (!t_was_cancelled() && has_body("application/sdp"))
{
#Enable RTPProxy with external->internal flags
if (!rtpproxy_answer("eior"))
{
xlog("L_ERR", "\nieor UNABLE TO NEGOTIATE MEDIA
$dlg_val(called) $ci $cs $rm $rs $rr $rd route[OUTBOUND]");
}
}
exit;
}
...
CALL SIP TRACE (with masking and notes):
udp:172.16.1.103:5060 -> udp:172.16.1.2:5060
INVITE sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP 172.16.1.103;rport;branch=z9hG4bKK5g6rgKDm91rF
Max-Forwards: 69
From: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
To: <sip:[email protected]>
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504466 INVITE
Contact: <sip:[email protected]:5060;transport=udp;gw=opensips>
User-Agent: FS
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO,
REGISTER, REFER, NOTIFY
Supported: timer, precondition, path, replaces
Allow-Events: talk, hold, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 229
X-FS-Support: update_display,send_info
Remote-Party-ID: "Masked"
<sip:[email protected]>;party=calling;screen=yes;privacy=off
v=0
o=FreeSWITCH 1351653721 1351653722 IN IP4 172.16.1.103
s=FreeSWITCH
c=IN IP4 172.16.1.103
t=0 0
m=audio 27340 RTP/AVP 0 8 3 101
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
udp:172.16.1.2:5060 -> udp:xxx.yyy.109.229:5060
INVITE sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP xxx.yyy.115.19;branch=z9hG4bK3065.5c632bf5.0
Max-Forwards: 69
From: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
To: <sip:[email protected]>
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504466 INVITE
Contact: <sip:xxx.yyy.115.19;did=2b1.52134a52>
User-Agent: FS
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO,
REGISTER, REFER, NOTIFY
Supported: timer, precondition, path, replaces
Allow-Events: talk, hold, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 249
X-FS-Support: update_display,send_info
Remote-Party-ID: "Masked"
<sip:[email protected]>;party=calling;screen=yes;privacy=off
v=0
o=FreeSWITCH 1351653721 1351653722 IN IP4 xxx.yyy.115.20 *rtpproxy_offer
correctly rewrote 172.16.1.103 with RTPProxy external IP*
s=FreeSWITCH
c=IN IP4 xxx.yyy.115.20 *rtpproxy_offer correctly rewrote 172.16.1.103
with RTPProxy external IP*
t=0 0
m=audio 36802 RTP/AVP 0 8 3 101
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20
a=nortpproxy:yes
udp:xxx.yyy.109.229 -> udp:172.16.1.2:5060
SIP/2.0 100 trying -- your call is important to us
Via: SIP/2.0/UDP xxx.yyy.115.19;branch=z9hG4bK3065.5c632bf5.0
From: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
To: <sip:[email protected]>
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504466 INVITE
Content-Length: 0
udp:xxx.yyy.109.229 -> udp:172.16.1.2:5060
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP xxx.yyy.115.19;branch=z9hG4bK3065.5c632bf5.0
Record-Route: <sip:xxx.yyy.109.229;lr=on>
From: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
To: <sip:[email protected]>;tag=0r3t2jXaB8HrF
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504466 INVITE
Contact: <sip:[email protected]:5080;transport=udp>
User-Agent: Masked
Accept: application/sdp
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, NOTIFY
Supported: timer, precondition, path, replaces
Allow-Events: talk, hold, conference, refer
Content-Length: 0
X-FS-Support: update_display,send_info
udp:172.16.1.2:5060 -> udp:172.16.1.103:5060
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 172.16.1.103;rport;branch=z9hG4bKK5g6rgKDm91rF
From: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
To: <sip:[email protected]>;tag=0r3t2jXaB8HrF
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504466 INVITE
Contact: <sip:172.16.1.2;did=2b1.52134a52>
User-Agent: Masked
Accept: application/sdp
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, NOTIFY
Supported: timer, precondition, path, replaces
Allow-Events: talk, hold, conference, refer
Content-Length: 0
X-FS-Support: update_display,send_info
udp:xxx.yyy.109.229 -> udp:172.16.1.2:5060
SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP xxx.yyy.115.19;branch=z9hG4bK3065.5c632bf5.0
Record-Route: <sip:xxx.yyy.109.229;lr=on>
From: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
To: <sip:[email protected]>;tag=0r3t2jXaB8HrF
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504466 INVITE
Contact: <sip:[email protected]:5080;transport=udp>
User-Agent: Masked
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, NOTIFY
Supported: timer, precondition, path, replaces
Allow-Events: talk, hold, conference, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 300
X-FS-Support: update_display,send_info
v=0
o=MASKED 2040649249 2040649250 IN IP4 xxx.yyy.109.231
s=MASKED
c=IN IP4 xxx.yyy.109.231
t=0 0
m=audio 18176 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=nortpproxy:yes
a=mptime:20 -
a=ptime:20
udp:172.16.1.2:5060 -> udp:172.16.1.103:5060
SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP 172.16.1.103;rport;branch=z9hG4bKK5g6rgKDm91rF
From: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
To: <sip:[email protected]>;tag=0r3t2jXaB8HrF
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504466 INVITE
Contact: <sip:172.16.1.2;did=2b1.52134a52>
User-Agent: Masked
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, NOTIFY
Supported: timer, precondition, path, replaces
Allow-Events: talk, hold, conference, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 300
X-FS-Support: update_display,send_info
v=0
o=MASKED 2040649249 2040649250 IN IP4 xxx.yyy.109.231 *rtpproxy_answer
failed and didn't correctly rewrite xxx.yyy.109.231 with 172.16.1.111*
s=MASKED
c=IN IP4 xxx.yyy.109.231 *rtpproxy_answer failed and didn't correctly
rewrite xxx.yyy.109.231 with 172.16.1.111*
t=0 0
m=audio 18176 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=nortpproxy:yes
a=mptime:20 -
a=ptime:20
udp:xxx.yyy.109.229 -> udp:172.16.1.2:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP xxx.yyy.115.19;branch=z9hG4bK3065.5c632bf5.0
Record-Route: <sip:xxx.yyy.109.229;lr=on>
From: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
To: <sip:[email protected]>;tag=0r3t2jXaB8HrF
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504466 INVITE
Contact: <sip:[email protected]:5080;transport=udp>
User-Agent: Masked
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, NOTIFY
Supported: timer, precondition, path, replaces
Allow-Events: talk, hold, conference, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 300
X-FS-Support: update_display,send_info
v=0
o=MASKED 2040649249 2040649250 IN IP4 xxx.yyy.109.231
s=MASKED
c=IN IP4 xxx.yyy.109.231
t=0 0
m=audio 18176 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=nortpproxy:yes
a=mptime:20 -
a=ptime:20
udp:172.16.1.2:5060 -> udp:172.16.1.103:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.16.1.103;rport;branch=z9hG4bKK5g6rgKDm91rF
From: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
To: <sip:[email protected]>;tag=0r3t2jXaB8HrF
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504466 INVITE
Contact: <sip:172.16.1.2;did=2b1.52134a52>
User-Agent: Masked
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, NOTIFY
Supported: timer, precondition, path, replaces
Allow-Events: talk, hold, conference, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 300
X-FS-Support: update_display,send_info
v=0
o=MASKED 2040649249 2040649250 IN IP4 xxx.yyy.109.231 *rtpproxy_answer
failed and didn't correctly rewrite xxx.yyy.109.231 with 172.16.1.111*
s=MASKED
c=IN IP4 xxx.yyy.109.231 *rtpproxy_answer failed and didn't correctly
rewrite xxx.yyy.109.231 with 172.16.1.111*
t=0 0
m=audio 18176 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=nortpproxy:yes
a=mptime:20 -
a=ptime:20
udp:172.16.1.103:5060 -> udp:172.16.1.2:5060
ACK sip:172.16.1.2;did=2b1.52134a52 SIP/2.0
Via: SIP/2.0/UDP 172.16.1.103;rport;branch=z9hG4bKp59etaDcXNH0F
Max-Forwards: 69
From: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
To: <sip:[email protected]>;tag=0r3t2jXaB8HrF
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504466 ACK
Contact: <sip:[email protected]:5060;transport=udp;gw=opensips>
Content-Length: 0
udp:172.16.1.2:5060 -> udp:xxx.yyy.109.229:5060
ACK sip:[email protected]:5080;transport=udp SIP/2.0
Record-Route: <sip:xxx.yyy.115.19;lr;ftag=jFFeX0H5cmNDK>
Route: <sip:xxx.yyy.109.229;lr=on>
Via: SIP/2.0/UDP xxx.yyy.115.19;branch=z9hG4bK3065.5c632bf5.2
Max-Forwards: 69
From: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
To: <sip:[email protected]>;tag=0r3t2jXaB8HrF
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504466 ACK
Contact: <sip:xxx.yyy.115.19;did=2b1.52134a52>
Content-Length: 0
udp:xxx.yyy.109.229 -> udp:172.16.1.2:5060
INFO sip:xxx.yyy.115.19;did=2b1.52134a52 SIP/2.0
Via: SIP/2.0/UDP xxx.yyy.109.229;branch=z9hG4bK6e65.6f3e25d3.0
Via: SIP/2.0/UDP xxx.yyy.109.231:5080;rport=5080;branch=z9hG4bKgr80UvtF7XcgQ
Max-Forwards: 68
From: <sip:[email protected]>;tag=0r3t2jXaB8HrF
To: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504475 INFO
Contact: <sip:[email protected]:5080;transport=udp>
User-Agent: Masked
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, NOTIFY
Supported: timer, precondition, path, replaces
Content-Type: message/update_display
Content-Length: 0
X-FS-Display-Name: Outbound Call
X-FS-Display-Number: 999900016XXXXXXX4764
Path: <sip:xxx.yyy.109.229;lr;received='sip:xxx.yyy.109.231:5080'>
udp:172.16.1.2:5060 -> udp:172.16.1.103:5060
INFO sip:[email protected]:5060;transport=udp;gw=opensips SIP/2.0
Record-Route: <sip:172.16.1.2;lr;ftag=0r3t2jXaB8HrF>
Via: SIP/2.0/UDP 172.16.1.2;branch=z9hG4bK6e65.921d9907.0
Max-Forwards: 68
From: <sip:[email protected]>;tag=0r3t2jXaB8HrF
To: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504475 INFO
Contact: <sip:172.16.1.2;did=2b1.52134a52>
User-Agent: Masked
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, NOTIFY
Supported: timer, precondition, path, replaces
Content-Type: message/update_display
Content-Length: 0
X-FS-Display-Name: Outbound Call
X-FS-Display-Number: 999900016XXXXXXX4764
Path: <sip:xxx.yyy.109.229;lr;received='sip:xxx.yyy.109.231:5080'>
udp:172.16.1.103:5060 -> udp:172.16.1.2:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.16.1.2;branch=z9hG4bK6e65.921d9907.0
From: <sip:[email protected]>;tag=0r3t2jXaB8HrF
To: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504475 INFO
User-Agent: FS
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO,
REGISTER, REFER, NOTIFY
Supported: timer, precondition, path, replaces
Content-Length: 0
udp:172.16.1.2:5060 -> udp:xxx.yyy.109.229:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP xxx.yyy.109.229;branch=z9hG4bK6e65.6f3e25d3.0
Via: SIP/2.0/UDP xxx.yyy.109.231:5080;rport=5080;branch=z9hG4bKgr80UvtF7XcgQ
From: <sip:[email protected]>;tag=0r3t2jXaB8HrF
To: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504475 INFO
User-Agent: FS
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO,
REGISTER, REFER, NOTIFY
Supported: timer, precondition, path, replaces
Content-Length: 0
udp:xxx.yyy.109.229 -> udp:172.16.1.2:5060
BYE sip:xxx.yyy.115.19;did=2b1.52134a52 SIP/2.0
Via: SIP/2.0/UDP xxx.yyy.109.229;branch=z9hG4bK3e65.b4b0e3a3.0
Via: SIP/2.0/UDP xxx.yyy.109.231:5080;rport=5080;branch=z9hG4bKUUyHF6Kp7Z1Xp
Max-Forwards: 68
From: <sip:[email protected]>;tag=0r3t2jXaB8HrF
To: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504476 BYE
Contact: <sip:[email protected]:5080;transport=udp>
User-Agent: Masked
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, NOTIFY
Supported: timer, precondition, path, replaces
Reason: Q.850;cause=16;text="NORMAL_CLEARING"
Content-Length: 0
Path: <sip:xxx.yyy.109.229;lr;received='sip:xxx.yyy.109.231:5080'>
udp:172.16.1.2:5060 -> udp:172.16.1.103:5060
BYE sip:[email protected]:5060;transport=udp;gw=opensips SIP/2.0
Record-Route: <sip:172.16.1.2;lr;ftag=0r3t2jXaB8HrF>
Via: SIP/2.0/UDP 172.16.1.2;branch=z9hG4bK3e65.9a0e87c.0
Max-Forwards: 68
From: <sip:[email protected]>;tag=0r3t2jXaB8HrF
To: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504476 BYE
Contact: <sip:172.16.1.2;did=2b1.52134a52>
User-Agent: Masked
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, NOTIFY
Supported: timer, precondition, path, replaces
Reason: Q.850;cause=16;text="NORMAL_CLEARING"
Content-Length: 0
Path: <sip:xxx.yyy.109.229;lr;received='sip:xxx.yyy.109.231:5080'>
udp:172.16.1.103:5060 -> udp:172.16.1.2:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP 172.16.1.2;branch=z9hG4bK3e65.9a0e87c.0
From: <sip:[email protected]>;tag=0r3t2jXaB8HrF
To: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504476 BYE
User-Agent: FS
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO,
REGISTER, REFER, NOTIFY
Supported: timer, precondition, path, replaces
Content-Length: 0
udp:172.16.1.2:5060 -> udp:xxx.yyy.109.229:5060
SIP/2.0 200 OK
Via: SIP/2.0/UDP xxx.yyy.109.229;branch=z9hG4bK3e65.b4b0e3a3.0
Via: SIP/2.0/UDP xxx.yyy.109.231:5080;rport=5080;branch=z9hG4bKUUyHF6Kp7Z1Xp
From: <sip:[email protected]>;tag=0r3t2jXaB8HrF
To: "Masked" <sip:[email protected]>;tag=jFFeX0H5cmNDK
Call-ID: a1d3a859-9dec-1230-51a9-85d0a5d992c4
CSeq: 35504476 BYE
User-Agent: FS
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, UPDATE, INFO,
REGISTER, REFER, NOTIFY
Supported: timer, precondition, path, replaces
Content-Length: 0
On 10/29/2012 7:44 AM, Bogdan-Andrei Iancu wrote:
Hi Seth,
The function can fail in several cases: parsing error for reply,
cannot contact rtpproxy, invalid reply from rtpproxy, etc.
Aside you script xlog, do you get any other err messages in the script
before the xlog (from the same process) - it might give a hint on the
internal failure of the function.
Regards,
Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com
On 10/26/2012 11:54 PM, Seth Schultz wrote:
Hello,
I am having an issue where rtpproxy_answer is failing in my
onreply_route block when processing 183 or 200 packets (snippet
below). This only happens on about 1% of the total call volume.
if (!rtpproxy_answer("eior"))
{
xlog("L_ERR", "UNABLE TO NEGOTIATE MEDIA");
}
1. How can I determine what is causing rtpproxy_answer to fail?
2. In what circumstances should I expect rtpproxy_answer to fail?
3. What action should I take if this happens?
Thank you very much for your time,
Seth
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