FAXing one way failure on FXS port on isr4331

[mmurman]

I set up a ISR4331 with MGCP to work on the FXS 0/1/0 port to connect a Fax machine.

I can call the FAX machine with me cell and it answers and gives the correct tones.  But when we try to send a FAX it give a fast busy.  So we connected a phone test set to the port.  The test set rings and we can answer it when we call it with our cell phone.  But when we try to call out using the test set, we get a fast busy.  her it the router voice config.

voice-port 0/1/0
description JAX XXX_XXX_XXXX

voice service voip
fax protocol pass-through g711ulaw

mgcp
mgcp call-agent USXD1VMSUB1.usxpress.com 2427 service-type mgcp version 0.1
mgcp dtmf-relay voip codec all mode nte-ca
mgcp rtp unreachable timeout 1000 action notify
mgcp modem passthrough voip mode nse
mgcp package-capability rtp-package
mgcp package-capability sst-package
mgcp package-capability pre-package
mgcp package-capability fm-package
no mgcp package-capability res-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp fax t38 inhibit
mgcp bind control source-interface GigabitEthernet0/0/0.101
mgcp bind media source-interface GigabitEthernet0/0/0.101
mgcp behavior rsip-range tgcp-only
mgcp behavior comedia-role none
mgcp behavior comedia-check-media-src disable
mgcp behavior comedia-sdp-force disable
!
mgcp profile default
!

[b.winter]

Does the port and / or the line in CUCM have the correct CSS assigned, to be able to make calls? Or are you sure, you are dialing correctly?
Sounds to me, that the device/line in CUCM has no permission to dial outside or you are not dailing correctly and there are not able to hit the correct dial patterns in CUCM.

[mmurman · Accepted solution]

Thank you for reaching out.   I changed the Port Information, Num Digits, on the device in CUCM to 10 and it started to work.

Issue has been resolved.