Working samples below. Location had issues with incoming while utilizing Fax Pass-through. Converted to T.38 Fax Relay and customer could then make neither in nor outbound faxes. After converting to T.38 Fax Relay had to remove mgcp modem passthrough voip redundancy.
Works great now.
2851 MGCP with PRI to PSTN snippet:
voice service voip
fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback cisco
!
ccm-manager fallback-mgcp
ccm-manager redundant-host 10.10.10.5
ccm-manager mgcp
ccm-manager fax protocol cisco
ccm-manager music-on-hold
ccm-manager config server 10.10.10.5
ccm-manager config
!
mgcp
mgcp call-agent 10.10.10.6 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
mgcp package-capability sst-package
mgcp package-capability pre-package
mgcp default-package fxr-package
no mgcp package-capability res-package
no mgcp timer receive-rtcp
mgcp timer net-cont-test 3000
mgcp sdp simple
mgcp fax t38 ecm
no mgcp explicit hookstate
mgcp fax t38 gateway force
mgcp rtp payload-type g726r16 static
mgcp bind control source-interface GigabitEthernet0/0.10
mgcp bind media source-interface GigabitEthernet0/0.10
mgcp behavior g729-variants static-pt
!
mgcp profile default
VG224 MGCP snippet:
voice service voip
fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback cisco
!
ccm-manager redundant-host 10.10.10.5
ccm-manager mgcp
no ccm-manager fax protocol cisco
ccm-manager music-on-hold
ccm-manager config server 10.10.10.5
ccm-manager config
!
mgcp
mgcp call-agent 10.10.10.6 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
mgcp package-capability sst-package
mgcp default-package fxr-package
no mgcp package-capability res-package
no mgcp timer receive-rtcp
mgcp timer net-cont-test 3000
mgcp sdp simple
mgcp fax t38 ecm
no mgcp explicit hookstate
mgcp fax t38 gateway force
mgcp rtp payload-type g726r16 static
!
mgcp profile default
!