[cisco-voip] Carrier routing issue?

[Dave Wolgast]

I am pretty confident that this does not have to do with CallManager (6.1.4,
MGCP PRI GWs with lots o' DIDs), but I am wondering if someone might help me
put together a method for approaching the issue...

Sporadically, for what seems like about a minute at a time, some callers to
our DIDs (mostly cellular callers) report getting a network message that the
call cannot be completed, or for Verizon Wireless callers, "the Verizon
Wireless customer you called is not available at this time."  My personal
experience is that I retry 2-4 times, and end up getting through.  It
doesn't happen often, but does seem to occur as things are starting to get
busy on the trunks.  That said, I never see blocking on the trunks when I
monitor using RTMT, even though utilization is fairly high.

The DIDs are on a trunk group of 5 Verizon PRIs, and in 2008, were ported by
Verizon to a different CO when headquarters moved a few miles down the road.

Any ideas for things I should look at/for?  Should I be calling Verizon, or
any of the cell carriers on which the issue was reported?

Thanks for any suggestions you might offer!

-- 
Dave Wolgast
Livonia, NY
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