Problem with Vitelity

[ronw]

I've been having problems with outgoing calls sent thru Vitelity for several weeks. I finally was able to narrow it down to their servers at ip 64.2.142.86 and 64.2.142.105. I can complete calls on their other two servers at ip 64.2.142.17 and 64.2.142.87. With sip debug on, I can see the invite going out, but never get a response. When the call timesout, I receive the following log:
[Feb 21 13:27:17] NOTICE[3869] chan_sip.c: Auto-congesting SIP/vitel-outbound-09f489b0
[Feb 21 13:27:17] VERBOSE[8600] logger.c: -- SIP/vitel-outbound-09f489b0 is circuit-busy
[Feb 21 13:27:17] VERBOSE[8600] logger.c: Reliably Transmitting (NAT) to 64.2.142.105:5060:
CANCEL sip:[email protected] SIP/2.0

If I set host=64.2.142.17 or host=64.2.142.87, then calls complete OK. I opened a ticket with Vitelity, but they cannot find anything wrong on their end and suggested that my ISP was blocking the two ip addresses. I can ping them OK.

Anyone having the same problem?

Ronw

 

[ronw]

Testing with sipsak, it does appear that port 5060 is blocked on ip 64.2.142.86 and 64.2.142.105. Same test on ip 64.2.142.17 and 64.2.142.87 indicate good. Also testing port 5061 indicates good on all addresses. What method can I use to determine where port 5060 is blocked?

Thanks,
ronw