Anyone seen this kind of problem? SIP traffic not getting to destination but traceroute does

[jsw at inconcepts.biz (Jeff Wheeler)]

On Wed, Nov 9, 2011 at 1:47 PM, Jay Nakamura <zeusdadog at gmail.com> wrote:
> So my questions is, is it possible there is some kind of filter at
> Qwest or Level 3 that is dropping traffic only for udp 5060 for select
> few IPs? ?That's the only explanation I can come up with other than

I ran into exactly this problem last week with Rogers.  All traffic
from the client except udp/5060 could be received by us, and udp/5060
was blocked.  We tested other IP addresses on our (provider) side and
did not find any blocking there, so we assigned a new IP to the SIP
gateway.  I hardly think this can be an ordinary malfunction, but good
luck getting a phone company to troubleshoot a problem with their
subscribers using mobile data to connect to a third-party voice
gateway...

-- 
Jeff S Wheeler <jsw at inconcepts.biz>
Sr Network Operator? /? Innovative Network Concepts