External faxing not working

[Cameron Whitehead]

I have fax machines setup on a VG310 and they are able to fax internally between each other with no issues.  When I try to send a fax externally I get a "Line Busy" error on the fax machine.  Inbound faxes don't seem to come in.  I cannot seem to find any reason that these should not work.

I also have analog phones configured on this same VG310 and they have no issues calling out or receiving calls.

[Roger Kallberg]

Make sure that you use g711 as the codec for the call out via your voice gateway for the out/in -bound calls from the VG port. What type of connection do you use for the connectivity with PSTN? Can you please share a debug of the failed calls?

[Cameron Whitehead]

I have g711 setup as the codec for this.  My PSTN is connected to a T1 PRI.  When I did Debug CCSIP Calls and Debug isdnq931 for outbound calls I got nothing in my logs when I did an outbound call.

[Roger Kallberg]

If you get nothing it would mean that the call doesn’t hit the gateway. For this you should look at call routing in CM. Start with doing a DNA and check calls from this device to the number that you’re trying to fax to.

[Mohammed al Baqari]

Hi,

Can you please disable fax relay in your dialpeer facing the phone
provider.?

**** please remember to rate useful posts

[Cameron Whitehead]

I currently do not have fax relay turned on for my dial-peers.

[Cameron Whitehead · Accepted solution]

Looks like I am having a communication error between one of my CUCM servers and the gateway.  I ended up switching the server my Trunk was communicating with and it worked just fine.