MGCP IOS gateway and ATA 186 in H323 mode – Fax Passthrough configuration

Posted: May 28, 2006 by sankar in Analog, ATA186, Fax

1. Configure MGCP gateway as usual (with FXS ports).

2. Give the following commands

     no ccm-manager fax protocol   — disables cisco fax relay

     mgcp modem passthrough voip mode nse  — enables modem passthrough

     mgcp modem passthrough voip codec g711ulaw

MGCP default NSE payload types

Output of "Sh mgcp"

MGCP media bind :DISABLED
MGCP Upspeed payload type for G711ulaw: 0,  G711alaw: 8 (You may opt to match this up with ATA NSE payload type)
MGCP Dynamic payload type for G.726-16K codec
MGCP Dynamic payload type for G.726-24K codec

3. Optionally you may want to disable T38 fax relay for MGCP (which is enabled by default)

mgcp fax t38 inhibit. (Useful if you want to just have passthrough enabled, and disable t38 fax on the gateway)

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