The call setup time is a little longger, we tried serveral methods: using terminator; adjust interdigit timeout; but didn't improve.
The signaling between 5350 and PBX is pri, we use RAS. We must use '.T' because of the variable length and too many sites.
I know the setup time of H323 is little longer then old PSTN and SIP. But I want to know if there are any other methods to improve.