User's Manual
14. Media
Version 6.8
169
Mediant 500 E-SBC
Notes:
•
The T.38 negotiation should be completed at call start according to V.152
procedure (as shown in the INVITE example below).
•
T.38 mid-call Re-INVITEs are supported.
•
If the remote party supports only T.38 Version 0, the device "downgrades" the
T.38 Version 3 to T.38 Version 0.
For example, the device sends or receives the following INVITE message, negotiating both
audio and image media:
INVITE sip:[email protected];user=phone SIP/2.0
Via: SIP/2.0/UDP 10.8.6.55;branch=z9hG4bKac1938966220
Max-Forwards: 70
From: <sip:[email protected]>;tag=1c1938956155
To: <sip:[email protected];user=phone>
Call-ID: [email protected]
CSeq: 1 INVITE
Contact: <sip:[email protected]:5060>
Supported: em,100rel,timer,replaces,path,resource-priority,sdp-
anat
Allow:
REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUB
SCRIBE,UPDATE
Remote-Party-ID:
<sip:[email protected]>;party=calling;privacy=off;screen=no;screen-
ind=0;npi=1;ton=0
Remote-Party-ID: <sip:[email protected]>;party=called;npi=1;ton=0
User-Agent: Audiocodes-Sip-Gateway-/v.6.00A.013.007
Content-Type: application/sdp
Content-Length: 433
v=0
o=AudiocodesGW 1938931006 1938930708 IN IP4 10.8.6.55
s=Phone-Call
c=IN IP4 10.8.6.55
t=0 0
m=audio 6010 RTP/AVP 18 97
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:97 telephone-event/8000
a=fmtp:97 0-15
a=ptime:20
a=sendrecv
m=image 6012 udptl t38
a=T38FaxVersion:3
a=T38MaxBitRate:33600
a=T38FaxMaxBuffer:1024
a=T38FaxMaxDatagram:122
a=T38FaxRateManagement:transferredTCF
a=T38FaxUdpEC:t38UDPRedundancy
14.2.4 V.150.1 Modem Relay
The device can be configured to transfer modem calls using a subset of the ITU-T V.150.1
Modem Relay protocol. The device also supports V.150.1 modem relay coder negotiation
in the initial SIP INVITE and 200 OK, using the SDP body according to the USA
Department of Defense (DoD) UCR-2008, Change 2 specification. This eliminates the need
for sending a re-INVITE to negotiate V.150.1. The device sends an INVITE’s SDP offer in a
Summary of Contents for Mediant 500 E-SBC
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Page 89: ...Part III General System Settings...
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Page 107: ...Part IV General VoIP Configuration...
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Page 441: ...Part VI Session Border Controller Application...
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Page 603: ...Part X Status Performance Monitoring and Reporting...
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Page 655: ...Part XI Diagnostics...
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Page 687: ...Part XII Appendix...
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