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SIP Trunk between CMEs - SIP/2.0 503 Service Unavailable

Hi guys,

I have a problem setting up a SIP trunk between two CMEs.

The topology is like this:

CME (SiteA) ----SIP---- H323GW (SiteB) ----- CUCM

SiteA can receive calls but the outgoing calls to siteB fail. In logs I got SIP Service Unavailable.

This is what happens:

SiteA -> INVITE -> SiteB

TRYING

RINGING

PRACK

OK for PRACK

          <- SIP/2.0 503 Service Unavailable <-

I've also tried with H323 but it failed as well.

Could anyone help?

Thanks.

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