MGCP & H323 IOS gateway and T38 faxing

Posted: May 28, 2006 by sankar in Analog, Fax

MGCP gateways and T38 

1. mgcp fax t38 ls_redundancy 0  OR

    mgcp fax t38 hs_redundancy 0

ls_redundancy set to 0 disables mgcp from sending redundant packets. The value can be set from  0  – 5 or 7 packets

hs_redundancy set to 0 disables mgcp from sending redundant packets for high speed fax m/c v.17, v27, v29 T.4 or T.6 fax machine. Default is 0, Can be configured up to 2 or 3.  0 disables redundancy.

Optional commands:

mgcp fax t38 gateway force  – This command forcest38 fax relay using NSE's eve if T38 and NSE's cannot be negotiated by the MGCP call agent at call setup time

mgcp fax t38 inhibit – Disables MGCP T38 fax relay.

mgcp tse payload <value>  – TSE is for Telephony signalling event. This command specifies payload value during fax and modem passthrough. Default is 100.

mgcp fax rate <rate>|voice  (Default rate is 7200 bps)

H323 gateways and T38

dial-peer voice 1 voip

fax rate voice

fax protocol t38 ls_redundancy 0

options available are : 

force – forces use of NSE;s to switch to T38 fax relay

fallback pass-through  g711ulaw | g711alaw – A fallback mode if T38 could not be negotiated.


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