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Fax through mgcp and sip in CUCM 11.5 = SIP/2.0 415 Unsupported Media Type

Hello colleagues.
Please help me to solve my problem.
I have a scheme:

City --- E1--- Cisco 3925 --- MGCP --- CUCM --- SIP --- FAX Server

When I trying to send fax from City to Fax Server, I have a problem

Cisco 3925 MGCP config

!
mgcp
mgcp call-agent MirUsw-UCMSub01.domain.ru 2427 service-type mgcp version 0.1
mgcp rtp unreachable timeout 1000 action notify
mgcp modem passthrough voip mode nse
mgcp codec g711alaw packetization-period 20
mgcp package-capability rtp-package
mgcp package-capability sst-package
mgcp package-capability pre-package
mgcp default-package fxr-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp fax t38 nsf 000000
mgcp rtp payload-type cisco-pcm-switch-over-alaw 127
mgcp rtp payload-type g726r16 static
mgcp bind control source-interface GigabitEthernet0/0
mgcp bind media source-interface GigabitEthernet0/0
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
!

Screenshots of config CUCM and logs in attachments

1 Reply 1

Jonathan Unger
Level 7
Level 7

Hi There,

Just curious if you ever got this issue solved.

If so, did it have anything to do with the packetization period of the G711a stream?