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CUCM voice

Posted on 2014-11-08
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Last Modified: 2014-11-23
Hi ;
I always see serial connection connected with a few channels dedicated to voice on Cisco site router config. I know the voice is encapsulated with data when it traverses to off site CUCM manager. My question is : is the above mentioned serial connection terminating to site PBX ? I am new to world of voice, so please pardon my ignorance.
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Question by:totaram
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by:José Méndez
ID: 40430536
Run this command: show isdn status


If you get output, then your serial connection is a PRI/BRI type of circuit, and what it does is, to pass calls from the Public Switched Telephony Network through IP packets to the CUCM.
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by:totaram
ID: 40431316
Thanks  Will;
Yes I see the output, with the primary designated signaling channel. So, I guess we have a PRI/BRI serial connection. One question though, does that mean that site should be using the regular analog phones... but something I remember that the site had cisco IP phone.. please clarify which phones should be used In this scenario?

Thanks;
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by:José Méndez
José Méndez earned 500 total points
ID: 40431665
The PRI type of trunk interface toward the PSTN does not have any implication on the type of phones used. The gateway is merely  an "adapter" to the PSTN network type. Behind the gateway you may have IP phones talking through TCP/IP to the CUCM Which controls and connects them to the gateway when outside users are called out or they call in.
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by:totaram
ID: 40431705
I see with what you are saying about the gateway acting as an adapter, but do not see how IP phones fit in PSTN environment behind the gateway. Do we need to have some sort of IP PBX to support these IP phones? Can we have regular phone and would they work the same?  

Thanks for all educational enlightening...
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José Méndez earned 500 total points
ID: 40431802
Well, the title of your post mentions CUCM, which is Cisco's IP PBX. Actually, 1 of 2 IP PBX. the other PBX is a featureset within IOS gateways called CME = Callmanager Express.

If you do not have a CUCM server that you are aware of, then you may be running CME. Run this command to gather more details about this possibility:

show telephony-service all

If you have some output, try to compare with this guide:

http://www.cisco.com/c/en/us/support/docs/voice-unified-communications/unified-communications-manager-express/68244-PhoneLoadUpgradeCCME.html

It means your gateway may be running as the IP PBX and controlling how PSTN calls connect to IP Phones registered to the gateway. By registering phones to the gateway, the gw is control of call routing, call features, phone provisioning, so on and so forth.
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by:totaram
ID: 40432009
Thanks Willy;
I will explain where my doubt lies:
All IP phones are connected to a POE switch on a voice VLAN, this POE switch Is somehow connected to the site core switch. The site router or the gateway is connected core switch via gi0/0. The gw has set of PVDM Cards and serial 0/0 and serial 0/1. Serial 0/0 is connected to 1xT1 from the ATT and Serial 0/1 has voice configuration (primary signaling link etc.). My question is where is the other end of Serial 0/1 connected? Initially I was thinking there is a PBX or something where it's going, but you rightfully pointed out that PBX really is CUCM or CME far-far away at the data center.

We just have 1xT1 from the provider and do not think there is any PRI circuit. Please let me know.
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by:José Méndez
ID: 40434189
Can you show me the entire output of the show isdn status please?
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by:totaram
ID: 40436565
I take it back, on this router I do not see anything w/ sh isdn stat, actally this command does not even exist.

On this router, sh gateway does show something:

xxxr01#sh gateway

H.323 ITU-T Version: 4.0   H323 Stack Version: 0.1

 H.323 service is up
 Gateway  xxxxr01  is registered to Gatekeeper XXXXX
Alias list (CLI configured)
 H323-ID xxxxr01
Alias list (last RCF)
 H323-ID xxxxr01

 H323 resource thresholding is Disabled
 Permanent Alternate Gatekeeper List
...
...
...
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by:José Méndez
ID: 40436600
What did the show telephony-service all showed?
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by:totaram
ID: 40441296
it says telephony-sevice is not enabled.
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by:José Méndez
ID: 40441651
Are those Cisco phones? What model are they?
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by:totaram
ID: 40448719
Hi Willy;
My major mistake... apologies

These phones are connected via some legacy IP PBXs at Latin American sites, which connects them to E1 interface on site router. The data encapsulates the voice and is sent to HQ CUCM. The protocol used while communicating to PBX is not ISDN , so sh isdn status will not work. The serial interface (from router) that I was talking about is connected to via CAB-E1/T1 cable to this digital PBX (mostly Siemens).

Thanks;
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by:José Méndez
ID: 40448890
Ok no worries. At this point could you please re-state what is it that you want to know?
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by:totaram
ID: 40449034
Well, just had a minor question: Can Cisco IP phones work w/ the digital IPXs (not IP PBX) at a site?
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Expert Comment

by:José Méndez
ID: 40460154
Not sure how to answer that question. IPXs are phone stations? If so, yes, Cisco phones and interoperate with any thing as long as the correct device is in the middle.
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