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FAX through PBX connected to Router

Mohamed Gaber

I do implementation in which PBXs are connected to Cisco routers using E&M ports at several sites. A FAX machine is connected to an extension on the PBX needs to communicate with another FAX machine connected to the PBX at another site. The settings of the E&M ports are here:

voice-port 0/0/0

trunk-group e&m

type 5

dial-type pulse

timing wait-wink 800

description E&M-PBX

A voip dial-peers are configured for the destination router.

dial-peer voice 95 voip

destination-pattern 95..

session target ipv4:

I tried some chnages but it did not work. I will try to configure the codec to G711 and no VAD and no EC on all ports and test it. But it will cost bandwidth.

Do anyone have another solution?

3 Replies 3

paolo bevilacqua
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Configure fax relay.

Thank you Paolo

I configured fax protocol pass-through under the service level and it worked. I wait the feedback from the customer if any problems arise.

voice service voip

fax protocol pass-through g711ulaw

A better choice is T.38 fax relay.

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