The gateway is registered to cucm, don't see the call hitting the gateway with any debugs, dialled number analyser say the call should go via the gateway.  As I say inbound are fine.

heres the mgcp conf

mgcp
mgcp call-agent 172.21.0.4 2427 service-type mgcp version 0.1
mgcp dtmf-relay voip codec all mode nse
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 package-capability fxr-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp fax t38 ecm
mgcp fax t38 inhibit
mgcp rtp payload-type g726r16 static
mgcp bind control source-interface GigabitEthernet0/0
mgcp bind media source-interface GigabitEthernet0/0
!
mgcp profile default

interface Serial0/0/0:15
no ip address
encapsulation hdlc
isdn switch-type primary-qsig
isdn timer T310 120000
isdn protocol-emulate network
isdn incoming-voice voice
isdn bind-l3 ccm-manager
no cdp enable

If you don't see anything on GW maybe your router pattern point to old gateway?
Have you updated your route lists or router patterns?

What about partition configuration on gateway? You said CSS is correct but maybe partiton is wrong.

Try some MGCP debugs to see that you receive MGCP packets during call setup.

If not then there must be something wrong on CM

If you receive MGCP packets, but the ISDN is not activated for call setup (Q931) then you might have an IOS bug.

Jan

If you use route lists, see if the RL is registered, or do a reset of the RL

route patterns, route lists all okay.  when I do a debug isdn q931 don't see the call getting to the router, but everything looks right, and dialled number analyser gives back what i'd expect...  Anyone any idea on the best mgcp debugs to use to see any attempt at call setup..

debug mgcp events