User`s manual

SIP User's Manual 406 Document #: LTRT-83303
Mediant 1000 & Mediant 600
In the 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.
Note: This section is applicable only to Mediant 1000.
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 406)
• Waiting for dial tone ''Two-Stage Dialing'' on page 408
• Time to wait before dialing
• Answer supervision
 Two-stage dialing (refer to ''Two-Stage Dialing'' on page 408)
 Dialing time
• Disconnect supervision (refer to ''Call Termination (Disconnect Supervision) on
FXO Devices'' on page 408)
• DID wink (refer to ''DID Wink'' on page 409)
7.3.1.1 One-Stage Dialing
One-stage dialing is when the FXO device receives an IP-to-Tel call, off-hooks the PBX
line connected to the telephone, and then immediately dials the destination telephone
number. In other words, the IP caller doesn't dial the PSTN number upon hearing a dial
tone.