Version 6.2
451
February 2011
SIP User's Manual
8. IP Telephony Capabilities
•
Set the CNG Detector Mode (CNGDetectorMode ini file) parameter to Disable
(default).
•
Set the following parameters to Disable:
♦
V.21 Modem Transport Type (V21ModemTransportType ini file)
♦
V.22 Modem Transport Type (V22ModemTransportType ini file)
♦
V.23 Modem Transport Type (V23ModemTransportType ini file)
♦
V.32 Modem Transport Type (V32ModemTransportType ini file)
♦
V.34 Modem Transport Type (V34ModemTransportType ini file)
4.
Set the V34FaxTransportType
ini
fle parameter to 1 (i.e., Relay).
5.
Set theT.38 Max Datagram Size (T38MaxDatagramSize ini file) parameter to 560
(default).
6.
Set the CEDTransferMode parameter to 0 (default).
Notes:
•
The T.38 negotiation should be completed at call start according to V.152
procedure (as shown in the INVITE example below).
•
Currently, T.38 mid call Re-INVITEs are not supported.
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
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