[OpenSER-Users] T.38 Fax Problem with RTPProxy
Raymond Chandler
intralanman at gmail.com
Fri Dec 7 04:12:45 CET 2007
In the following, I have a T.38 Fax call in which I'm forcing RTPProxy.
The signalling follows this draft
(http://tools.ietf.org/html/draft-mule-sip-t38callflows-02#section-5.2),
but the UDPTL media seems to have problems.
The problem is that OpenSER/RTPProxy seems to ignore the address in the
SDP of the "200 OK".
As I understand it, RTPProxy should, adequately enough, proxy the UDPTL.
(not just rtp)
The call flow is as follows:
UC -> EDGE
EDGE -> OpenSER
OpenSER -> EU (not shown in this trace)
NOTE: IPs have been changed to protect the innocent ;-)
192.168.174.156 represents our UC's (Underlying Carrier's) IP
192.168.48.88 represents our edge proxy
192.168.202.10 represents our OpenSER box
Below, I have what I consider to be the "relevent" packets with large
portions of repetition SNIP'd....
Below that, I have the two (again, what I consider to be) relevent
packets with details of the SDP
In both of the SDP details, our edge uses the UC's IP (192.168.174.156)
in the c= line of the SDP.
I don't see that being overwritten in any of the "media-specific"
sections following.
OpenSER/RTPProxy handle the RTP appropriately (to the best of my
knowledge) but send the t.38 UDPTL media back to our edge which is, of
course, rejecting it.
"No.", "Time", "Source", "Destination", "Protocol", "Info"
"1", "0.000000", "192.168.48.88", "192.168.202.10", "SIP/SDP", "Request:
INVITE sip:1NPANXX0119 at 192.168.202.10:6080, with session description"
"2", "0.005027", "192.168.202.10", "192.168.48.88", "SIP", "Status: 100
Trying"
"3", "0.286018", "192.168.202.10", "192.168.48.88", "SIP", "Status: 180
Ringing"
"4", "9.397591", "192.168.202.10", "192.168.48.88", "SIP/SDP", "Status:
200 OK, with session description"
"5", "9.410633", "192.168.202.10", "192.168.48.88", "RTP", "Payload
type=ITU-T G.711 PCMU, SSRC=3122798450, Seq=5169, Time=374804094"
"6", "9.439195", "192.168.48.88", "192.168.202.10", "SIP", "Request: ACK
sip:1NPANXX0119 at 192.168.202.10:6080"
"7", "9.440987", "192.168.202.10", "192.168.48.88", "RTP", "Payload
type=ITU-T G.711 PCMU, SSRC=3122798450, Seq=5170, Time=374804334"
"8", "9.448560", "192.168.48.88", "192.168.202.10", "ICMP", "Destination
unreachable (Port unreachable)"
"9", "9.470710", "192.168.202.10", "192.168.48.88", "RTP", "Payload
type=ITU-T G.711 PCMU, SSRC=3122798450, Seq=5171, Time=374804574"
"10","9.479789","69.25.48.88","67.15.202.10","ICMP","Destination
unreachable (Port unreachable)"
"11","9.490158","207.218.174.156","67.15.202.10","RTP","PT=ITU-T G.711
PCMU, SSRC=0xCF806328, Seq=0, Time=0, Mark "
"12","9.500186","67.15.202.10","207.218.174.156","RTP","PT=ITU-T G.711
PCMU, SSRC=0xBA221F72, Seq=5172, Time=374804814 "
"13","9.509146","69.25.48.88","67.15.202.10","ICMP","Destination
unreachable (Port unreachable)"
"14","9.510270","207.218.174.156","67.15.202.10","RTP","PT=ITU-T G.711
PCMU, SSRC=0xCF806328, Seq=1, Time=160 "
"15","9.530265","207.218.174.156","67.15.202.10","RTP","PT=ITU-T G.711
PCMU, SSRC=0xCF806328, Seq=2, Time=320 "
"16","9.530283","67.15.202.10","207.218.174.156","RTP","PT=ITU-T G.711
PCMU, SSRC=0xBA221F72, Seq=5173, Time=374805054 "
~~~~ SNIP ~~~~
"174", "11.430039", "192.168.174.156", "192.168.202.10", "RTP", "Payload
type=ITU-T G.711 PCMU, SSRC=3481297704, Seq=97, Time=15520"
"175", "11.450027", "192.168.174.156", "192.168.202.10", "RTP", "Payload
type=ITU-T G.711 PCMU, SSRC=3481297704, Seq=98, Time=15680"
"176", "11.457118", "192.168.202.10", "192.168.48.88", "SIP/SDP",
"Request: INVITE sip:Restricted at 192.168.48.88, with session description"
"177", "11.468025", "192.168.202.10", "192.168.174.156", "T.38", "UDP:
UDPTLPacket Seq=32768 [UNKNOWN PER: unknown choice extension][Malformed
Packet]"
"178", "11.470013", "192.168.174.156", "192.168.202.10", "RTP", "Payload
type=ITU-T G.711 PCMU, SSRC=3481297704, Seq=99, Time=15840"
"179", "11.490125", "192.168.174.156", "192.168.202.10", "RTP", "Payload
type=ITU-T G.711 PCMU, SSRC=3481297704, Seq=100, Time=16000"
"180", "11.492010", "192.168.202.10", "192.168.174.156", "T.38", "UDP:
UDPTLPacket Seq=32768 [UNKNOWN PER: unknown choice extension][Malformed
Packet]"
"181", "11.499118", "192.168.48.88", "192.168.202.10", "SIP", "Status:
100 Trying"
"182", "11.510111", "192.168.174.156", "192.168.202.10", "RTP", "Payload
type=ITU-T G.711 PCMU, SSRC=3481297704, Seq=101, Time=16160"
"183", "11.515999", "192.168.202.10", "192.168.174.156", "T.38", "UDP:
UDPTLPacket Seq=32768 [UNKNOWN PER: unknown choice extension][Malformed
Packet]"
"184", "11.530100", "192.168.174.156", "192.168.202.10", "RTP", "Payload
type=ITU-T G.711 PCMU, SSRC=3481297704, Seq=102, Time=16320"
"185", "11.540998", "192.168.202.10", "192.168.174.156", "T.38", "UDP:
UDPTLPacket Seq=32768 [UNKNOWN PER: unknown choice extension][Malformed
Packet]"
"186", "11.550087", "192.168.174.156", "192.168.202.10", "RTP", "Payload
type=ITU-T G.711 PCMU, SSRC=3481297704, Seq=103, Time=16480"
"187", "11.570073", "192.168.174.156", "192.168.202.10", "RTP", "Payload
type=ITU-T G.711 PCMU, SSRC=3481297704, Seq=104, Time=16640"
"188", "11.580068", "192.168.174.156", "192.168.202.10", "RTP", "Unknown
RTP version 0"
"189", "11.581986", "192.168.202.10", "192.168.174.156", "T.38", "UDP:
UDPTLPacket Seq=32768 [UNKNOWN PER: unknown choice extension][Malformed
Packet]"
"190", "11.590061", "192.168.174.156", "192.168.202.10", "RTP", "Unknown
RTP version 0"
"191", "11.599929", "192.168.174.156", "192.168.202.10", "RTP", "Unknown
RTP version 0"
"192", "11.605977", "192.168.202.10", "192.168.174.156", "T.38", "UDP:
UDPTLPacket Seq=32768 [UNKNOWN PER: unknown choice extension][Malformed
Packet]"
"193", "11.608549", "192.168.48.88", "192.168.202.10", "SIP/SDP",
"Status: 200 OK, with session description"
"194", "11.630936", "192.168.202.10", "192.168.48.88", "T.38", "UDP:
UDPTLPacket Seq=32768 [UNKNOWN PER: unknown choice extension][Malformed
Packet]"
"195", "11.660168", "192.168.202.10", "192.168.48.88", "T.38", "UDP:
UDPTLPacket Seq=32768 [UNKNOWN PER: unknown choice extension][Malformed
Packet]"
"196", "11.668760", "192.168.48.88", "192.168.202.10", "ICMP",
"Destination unreachable (Port unreachable)"
"197", "11.690405", "192.168.202.10", "192.168.48.88", "T.38", "UDP:
UDPTLPacket Seq=32768 [UNKNOWN PER: unknown choice extension][Malformed
Packet]"
"198", "11.697992", "192.168.48.88", "192.168.202.10", "ICMP",
"Destination unreachable (Port unreachable)"
"199", "11.720762", "192.168.202.10", "192.168.48.88", "T.38", "UDP:
UDPTLPacket Seq=32768 [UNKNOWN PER: unknown choice extension][Malformed
Packet]"
"200", "11.728847", "192.168.48.88", "192.168.202.10", "ICMP",
"Destination unreachable (Port unreachable)"
"201", "11.750120", "192.168.202.10", "192.168.48.88", "T.38", "UDP:
UDPTLPacket Seq=32768 [UNKNOWN PER: unknown choice extension][Malformed
Packet]"
"202", "11.758827", "192.168.48.88", "192.168.202.10", "ICMP",
"Destination unreachable (Port unreachable)"
"203", "11.780601", "192.168.202.10", "192.168.48.88", "T.38", "UDP:
UDPTLPacket Seq=32768 t30ind: no-signal hdlc-fcs-BAD-sig-end
t4-non-ecm-sig-end [Malformed?] hdlc-fcs-BAD-sig-end hdlc-data[Malformed
Packet]"
"204", "11.788059", "192.168.48.88", "192.168.202.10", "ICMP",
"Destination unreachable (Port unreachable)"
"205", "11.811073", "192.168.202.10", "192.168.48.88", "T.38", "UDP:
UDPTLPacket Seq=32768 t30ind: no-signal hdlc-fcs-BAD-sig-end
t4-non-ecm-sig-end [Malformed?] hdlc-fcs-BAD-sig-end
hdlc-sig-end[Malformed Packet]"
"206", "11.818665", "192.168.48.88", "192.168.202.10", "ICMP",
"Destination unreachable (Port unreachable)"
"207", "11.833039", "192.168.202.10", "192.168.48.88", "SIP", "Request:
ACK sip:Restricted at 192.168.48.88:5060"
"208", "11.839935", "192.168.202.10", "192.168.48.88", "T.38", "UDP:
UDPTLPacket Seq=32768 t30ind: cng hdlc-fcs-BAD-sig-end
t4-non-ecm-sig-end [Malformed?] hdlc-fcs-BAD-sig-end
hdlc-fcs-OK[Malformed Packet]"
"209", "11.849145", "192.168.48.88", "192.168.202.10", "ICMP",
"Destination unreachable (Port unreachable)"
"210", "11.868409", "192.168.202.10", "192.168.48.88", "T.38", "UDP:
UDPTLPacket Seq=00000 t30ind: no-signal"
"211", "11.878000", "192.168.48.88", "192.168.202.10", "ICMP",
"Destination unreachable (Port unreachable)"
"212", "11.905983", "192.168.48.88", "192.168.202.10", "ICMP",
"Destination unreachable (Port unreachable)"
"213", "14.428661", "192.168.202.10", "192.168.48.88", "T.38", "UDP:
UDPTLPacket Seq=00001 t30ind: v21-preamble"
~~~~ SNIP ~~~~
"389", "32.869453", "192.168.202.10", "192.168.48.88", "T.38", "UDP:
UDPTLPacket Seq=00114 t30ind: no-signal"
"390", "41.696978", "192.168.202.10", "192.168.48.88", "SIP", "Request:
BYE sip:Restricted at 192.168.48.88:5060"
"391", "41.738094", "192.168.48.88", "192.168.202.10", "SIP", "Status:
200 OK"
No. Time Source Destination Protocol
Info
1 0.000000 192.168.48.88 192.168.202.10
SIP/SDP Request: INVITE sip:1NPANXX0119 at 192.168.202.10:6080, with
session description
Frame 1 (966 bytes on wire, 966 bytes captured)
Ethernet II, Src: 00:1e:13:ca:4a:3f (00:1e:13:ca:4a:3f), Dst:
Dell_ed:4a:1c (00:12:3f:ed:4a:1c)
Internet Protocol, Src: 192.168.48.88 (192.168.48.88), Dst:
192.168.202.10 (192.168.202.10)
User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 6080 (6080)
Session Initiation Protocol
Request-Line: INVITE sip:1NPANXX0119 at 192.168.202.10:6080 SIP/2.0
Message Header
Message body
Session Description Protocol
Session Description Protocol Version (v): 0
Owner/Creator, Session Id (o): BRSDP 187392 187392 IN IP4
192.168.174.156
Session Name (s): BRSDP Session
Connection Information (c): IN IP4 192.168.174.156
Time Description, active time (t): 0 0
Media Description, name and address (m): audio 53278 RTP/AVP
0 8 18 100
Media Attribute (a): rtpmap:0 PCMU/8000
Media Attribute (a): rtpmap:8 PCMA/8000
Media Attribute (a): rtpmap:18 G729/8000
Media Attribute (a): rtpmap:100 telephone-event/8000
Media Attribute (a): fmtp:100 0-15
No. Time Source Destination Protocol
Info
193 11.608549 192.168.48.88 192.168.202.10
SIP/SDP Status: 200 OK, with session description
Frame 193 (1013 bytes on wire, 1013 bytes captured)
Ethernet II, Src: 00:1e:13:ca:4a:3f (00:1e:13:ca:4a:3f), Dst:
Dell_ed:4a:1c (00:12:3f:ed:4a:1c)
Internet Protocol, Src: 192.168.48.88 (192.168.48.88), Dst:
192.168.202.10 (192.168.202.10)
User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 6080 (6080)
Session Initiation Protocol
Status-Line: SIP/2.0 200 OK
Message Header
Message body
Session Description Protocol
Session Description Protocol Version (v): 0
Owner/Creator, Session Id (o): BRSDP 187392 187393 IN IP4
192.168.174.156
Session Name (s): BRSDP Session
Connection Information (c): IN IP4 192.168.174.156
Time Description, active time (t): 0 0
Media Description, name and address (m): image 53278 udptl t38
Media Attribute (a): T38FaxVersion:0
Media Attribute (a): T38MaxBitRate:14400
Media Attribute (a): T38FaxRateManagement:transferredTCF
Media Attribute (a): T38FaxMaxBuffer:262
Media Attribute (a): T38FaxMaxDatagram:176
Media Attribute (a): T38FaxUdpEC:t38UDPRedundancy
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