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MediaPack Series
In the previous example, V.152 implementation is supported (using the dynamic payload
type 96 and G.711 u-law as the VBD codec) as well as the voice codecs G.711 µ-law and
G.729.
Instead of using VBD transport mode, the V.152 implementation can use alternative relay
fax transport methods (e.g., fax relay over IP using T.38). The preferred V.152 transport
method is indicated by the SDP ‘pmft’ attribute. Omission of this attribute in the SDP
content means that VBD mode is the preferred transport mechanism for voice-band data.
To configure T.38 mode, use the CoderName parameter.
7.3
FXO Operating Modes
This section provides a description of the FXO operating modes and device configurations
for Tel-to-IP and IP-to-Tel calls.
7.3.1
IP-to-Telephone Calls
The FXO device provides the following operating modes for IP-to-Tel calls:
„
One-stage dialing (refer to ''One-Stage Dialing'' on page 323)
•
Waiting for dial tone ''Two-Stage Dialing'' on page 324
•
Time to wait before dialing
•
Answer supervision
„
Two-stage dialing (refer to ''Two-Stage Dialing'' on page 324)
„
Dialing time
•
Disconnect supervision (refer to ''Call Termination (Disconnect Supervision) on
FXO Devices'' on page 324)
•
DID wink (refer to ''DID Wink'' on page 325)
SIP User's Manual
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Document #: LTRT-65410