12-12-2013 06:16 AM - edited 03-16-2019 08:50 PM
Recently upgraded a gateway from 2821 to 2921. Voice config did not change at all on the ISR.
Faxes coming in and out of the PRI are failing on fax machines that are on VG-224s only. Fax machines on ATAs have no issue.
I tried changing the settings from passthrough to relay on the VG-224 with no luck. Any ideas on where to start? Thanks in advance.
12-12-2013 07:27 AM
Fax relay is not supported on PVDM3s which is probably what changed for you when going from 2821 to 2921. Can you post your relevant config from the router and VG224?
Chris
12-12-2013 08:21 AM
2921 Config
voice service voip
allow-connections h323 to h323
allow-connections h323 to sip
allow-connections sip to h323
allow-connections sip to sip
fax protocol t38 version 0 ls-redundancy 5 hs-redundancy 2 fallback pass-through g711ulaw
h323
sip
bind control source-interface loopback1
bind media source-interface loopback1
!
voice class codec 1
codec preference 1 g711ulaw
codec preference 2 g729r8
!
voice class codec 2
codec preference 1 g729r8
!
voice class h323 1
h225 timeout tcp establish 3
call preserve
VG224
voice service voip
fax protocol t38 ls-redundancy 5 hs-redundancy 2 fallback pass-through g711ulaw
!
ccm-manager fax protocol cisco
ccm-manager music-on-hold
ccm-manager sccp local FastEthernet0/0
!
mgcp fax t38 ecm
12-12-2013 03:04 PM
So, it looks like you are using protocol based T.38, however your VG224 is not properly configured for protocol based T.38 as you are missing the following:
mgcp package-capability fxr-package
mgcp default-package fxr-package
These two commands are needed to go from the default configuration of NSE-based T.38 to protocol-based T.38.
The command no mgcp fax t38 inhibit is required for both NSE and protocol-based T.38, but it is the default.
HTH,
Chris
12-13-2013 10:19 AM
Chris,
The following fixed the issue for us. Previous config in 2821 didn't work on 2921. Thanks again for your posts!
Aaron
***Added the following to 2921 and VG224 configs.
voice service pots
fax rate disable
!
voice service voip
fax protocol none
modem passthrough nse codec g711ulaw
***VG224 set to Fax Passthrough and Modem Passthrough Enable in CUCM.
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