T.38 version 3 support with MGCP

[bill.roland]

Does anyone know if T.38 v3 fax relay is supported on Cisco ISRG2 gateways running MGCP?  The documentation that I've found talks about it being supported for SIP and H323 but not for MGCP...but these documents are not necessarily current.  I am curious if support is available now?  We do have SuperG3 running fine using modem passthrough, but I know T.38 is the preferred method for FoIP.  Thanks.

Bill

[Chris Deren · Accepted solution]

No, MGCP does not offer protocol based T.38 V3, currently only H323 and SIP offer it as of IOS 15.1.1T.

HTH,

Chris

[bill.roland]

Thanks, Chris.  We'll stick with modem passthrough I suppose until Cisco gets around to implementing it.