SV8100 SIP Trunks

[Jackcmann]

I have a SV8100 with 40 SIP trunks configured. The SIP trunks are divided up into 4 groups of 10. Each group having there own DDI setup.
The problem i am experiencing is that sometimes you have to dial 3 to 4 times before getting connected. The carrier has assured me that there is no limitations on the number of concurrent calls. When running a wire-shark trace, the call that does not connect does not show up on the trace.

 

[Kinetix]

Are you using different SIP Profiles and or different Trunk Access Maps?
Another thing to look at may be the timers for outgoing calls - 21-01:02 and 2101:03 (Interdigit timers). Sometimes if they are too short, could cause outgoing call problems, even on some analogue lines. Default timers are 10 / 10.