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New Contributor III

T38 FAX Codec

I have a customer that shares a PRI with a local FAX server and a PBX, about 40 DID's are dedicated to the FAX server.  I am having issues with FAX completion, after many config changes we are going to route the dedicated DID's through a T38 trunk. My question is, in the 904 when I enable Modem pass-through and enable T38 will the codec be used only on FAX tone detection.

voice trunk T02 type isdn

  description "PRI to PBX"

  resource-selection linear ascending

  caller-id-override number-inbound xxxxxxxxxx

  connect isdn-group 1



  rtp delay-mode adaptive

  codec-list "SIP to PRI"

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Honored Contributor
Honored Contributor

Re: T38 FAX Codec

Yes, it will only come into play when a fax is detected. Voice calls will not be affected by T38 settings.

New Contributor III

Re: T38 FAX Codec

Thanks jayh