[cisco-voip] Carrier routing issue?

[Lelio Fulgenzi]

A PRI group will have an upper limit on the number of inbound calls available, so even though you have 5 PRIs (5x23=115 calls assuming no shared D channels) the group might have an upper limit of 95 inbound calls in order to always have 20 outbound calls. 

Something to consider... 

--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 



From: "Dave Wolgast" <dwolgas1 at rochester.rr.com> 
To: "Cisco VOIP Newsletter - puck.nether.net" <cisco-voip at puck.nether.net> 
Sent: Thursday, August 5, 2010 9:14:26 AM 
Subject: [cisco-voip] Carrier routing issue? 

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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