We have a very curious situation: when I try to place a call to an international number that is a number to add to a Conference provided by a Service OPerator (you have to put an ID and password to enter your conference)the call always works if I go out through an H323 gateway but if I go out through an MGCP gateway the call works only 1 of 3 times. No problem with other international calls with MGCP. The termination cause is "34 : No circuit/channel available"
Verify the bandwidth setting for the 'Location' in Callmanager. If the bandwidth is low than the actual call admission control will not allow calls to go once the bandwidth exceed the configured value.
We have a similar problem, although it is with a Fax server connected via a PRI. Everything is fine as long as only one call at a time is placed, but then it busies out.
We have a TAC case open and TAC says it is a problem of the Service Provider that is not sending a mandatory IE. However the SP says it is not mandatory... We do not have the solution yet
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