Version 6.8 167 Mediant 2600 E-SBC
User's Manual 14. Media
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 CodersGroup parameter.
Note: You can also configure the device to handle G.711 coders received in INVITE
SDP offers as VBD coders, using the HandleG711asVBD parameter. For example, if
the device is configured with G.729 and G.711 VBD coders and it receives an INVITE
with an SDP offer containing G.729 and “regular” G.711 coders, it sends an SDP
answer containing G.729 and G.711 VBD coders, allowing subsequent bypass
(passthrough) sessions if fax / modem signals are detected during the call.
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