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.<br><br>As well, you've got modem passthrough configured on the MGCP gateway. This uses NSE's which are Cisco proprietary.<br>
<br>On the CUBE you've got protocol based T38 configured. This is correct if the SIP provider supports T.38.<br><br>So your hypothetical best-case scenario should look like this:<br><br>Fax-VG224--(MGCP protocol T.38)--CUCM---SIP--CUBE---(SIP protocol T.38)---SIP provider (supports T.38)<br>
<br><br>You would need to make these changes to your MGCP gateway:<br><br> mgcp package-capability fxr-package<br> mgcp default-package fxr-package<br> no mgcp fax t38 inhibit (default)<br> no mgcp modem passthrough voip mode nse<br>
<br>You may also want to upgrade the VG224 IOS to something more recent.<br><br><br>Nick Matthews<br>CCIE #23560<br>Systems Engineer - GA Select<br>678.352.3770<br><br><div class="gmail_quote">On Thu, Jan 27, 2011 at 2:40 PM, Dave Wolgast <span dir="ltr"><<a href="mailto:dwolgas1@rochester.rr.com">dwolgas1@rochester.rr.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">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.<br>
<br>I am running the following config with CUCM 6.1(4):<br>
<br>Analog Fax==>VG224(MGCP)==>CUCM==>SIP Trunk==>CUBE==>SIP Trunk to SP<br><br>CUBE is 3845 running Advanced Enterprise 12.4(22)YB6<br>VG224 is running 12.4(2)T5<br><br>The service provider specifies the following config for the CUBE (From the Cisco Interop Portal):<br>
<br>voice service voip <br> allow-connections sip to sip<br> redirect ip2ip<br> fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback pass-through g711ulaw<br> sip<br> bind control source-interface Loopback0<br> bind media source-interface Loopback0<br>
rel1xx disable<br> header-passing error-passthru<br> early-offer forced<br> midcall-signaling passthru<br> sip-profiles 100<br><br>The SIP Profile only modifies some headers slightly in the SDP<br><br>Config on the VG224 is as follows:<br>
<br>ccm-manager redundant-host 10.x.x.x 10.x.x.x<br>ccm-manager mgcp<br>ccm-manager music-on-hold<br>ccm-manager config server 10.x.x.x 10.x.x.x<br>ccm-manager config<br>! <br>mgcp <br>mgcp call-agent 10.x.x.x 2427 service-type mgcp version 0.1<br>
mgcp dtmf-relay voip codec all mode out-of-band<br>mgcp rtp unreachable timeout 1000 action notify<br>mgcp modem passthrough voip mode nse<br>mgcp package-capability rtp-package<br>no mgcp package-capability res-package<br>
mgcp package-capability sst-package<br>no mgcp package-capability fxr-package<br>no mgcp timer receive-rtcp<br>mgcp sdp simple<br>mgcp rtp payload-type g726r16 static<br>! <br>mgcp profile default<br><br>In CUCM, the VG224 Fax Mode is set to Fax Relay.<br>
<br>Thanks so much for any assistance you can give.<br clear="all"><font color="#888888"><br>-- <br>Dave Wolgast<br>Livonia, NY<br>
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