[cisco-voip] MGCP VG224 fax to/from PSTN via SIP Trunk

[Nick Matthews]

MGCP doesn't support protocol based pass-through.  Some providers (Verizon)
only support protocol based passthrough, so you will not be able to include
a MGCP device in the SIP trunk path with Verizon.

As well, you've got modem passthrough configured on the MGCP gateway.  This
uses NSE's which are Cisco proprietary.

On the CUBE you've got protocol based T38 configured.  This is correct if
the SIP provider supports T.38.

So your hypothetical best-case scenario should look like this:

Fax-VG224--(MGCP protocol T.38)--CUCM---SIP--CUBE---(SIP protocol
T.38)---SIP provider (supports T.38)


You would need to make these changes to your MGCP gateway:

    mgcp package-capability fxr-package
    mgcp default-package fxr-package
    no mgcp fax t38 inhibit (default)
    no mgcp modem passthrough voip mode nse

You may also want to upgrade the VG224 IOS to something more recent.


Nick Matthews
CCIE #23560
Systems Engineer - GA Select
678.352.3770

On Thu, Jan 27, 2011 at 2:40 PM, Dave Wolgast <dwolgas1 at rochester.rr.com>wrote:

> Wondering if anyone has any suggestions as to how I might proceed with
> troubleshooting, as I can't seem to get a fax received/transmitted with what
> I have.  Hopefully something jumps out immediately.
>
> I am running the following config with CUCM 6.1(4):
>
> Analog Fax==>VG224(MGCP)==>CUCM==>SIP Trunk==>CUBE==>SIP Trunk to SP
>
> CUBE is 3845 running Advanced Enterprise 12.4(22)YB6
> VG224 is running 12.4(2)T5
>
> The service provider specifies the following config for the CUBE (From the
> Cisco Interop Portal):
>
> voice service voip
>  allow-connections sip to sip
>  redirect ip2ip
>  fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback pass-through
> g711ulaw
>  sip
>   bind control source-interface Loopback0
>   bind media source-interface Loopback0
>   rel1xx disable
>   header-passing error-passthru
>   early-offer forced
>   midcall-signaling passthru
>   sip-profiles 100
>
> The SIP Profile only modifies some headers slightly in the SDP
>
> Config on the VG224 is as follows:
>
> ccm-manager redundant-host 10.x.x.x 10.x.x.x
> ccm-manager mgcp
> ccm-manager music-on-hold
> ccm-manager config server 10.x.x.x 10.x.x.x
> ccm-manager config
> !
> mgcp
> mgcp call-agent 10.x.x.x 2427 service-type mgcp version 0.1
> mgcp dtmf-relay voip codec all mode out-of-band
> mgcp rtp unreachable timeout 1000 action notify
> mgcp modem passthrough voip mode nse
> mgcp package-capability rtp-package
> no mgcp package-capability res-package
> mgcp package-capability sst-package
> no mgcp package-capability fxr-package
> no mgcp timer receive-rtcp
> mgcp sdp simple
> mgcp rtp payload-type g726r16 static
> !
> mgcp profile default
>
> In CUCM, the VG224 Fax Mode is set to Fax Relay.
>
> Thanks so much for any assistance you can give.
>
> --
> Dave Wolgast
> Livonia, NY
>
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>
>
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