Configuring Voice Gateways using SIP or H.323 protocol
In this configuration, StoneFax directly sends and receives SIP calls managing faxes through T.38 first and fallback to passthrough in case T.38 is not available (e.g.: sending fax internally to Cisco ATA devices).
This configuration can be chosen if you have CallManager Express or if you have CallManager with at least one voice port configured in h.323 or SIP. You cannot directly send faxes through the Voice Gateway if it is configured with MGCP.
On the voice gateway you must enable T.38 and fallback to G.711 passthrough in global configuration mode (G.711alaw in the examples)
voice service voip
fax protocol t38 fallback pass-through g711alaw
Then a dial-peer must be added to route incoming faxes to StoneFax. The session target points to the IAS machine and the codec is g711alaw.
dial-peer voice 1 voip
description INCOMING FAX FROM PSTN TO STONEFAX
session target ipv4:10.10.10.1
session protocol sipv2
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