two cme

Answered Question
Dec 18th, 2009
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hi,



I have one CME support 48 IP phones and I want to extended without replace it with higher one, I buy another CME same model number support 48 IP phone, what I did is split the phone line to two one going to old one and the other going to new one, when some one call both CME will ring, but what I need is how can I transfer the extinction 1111 on old one to 1222 to new one if both connect through UTP cable.


regards

Correct Answer by Chuan Liu about 7 years 5 months ago

Hi,


Recommend or not all depend on your particular scenario. It is quite normal to share one or more PSTN gateways in an enterprise environment.

You have one small site and are using POTS lines for PSTN connection. How many lines do you have? It may not have enouogh capacity to handle incoming and outgoing calls for more than one CME.

Here is a link you can use for connecting multiple CME's http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/srnd/design/guide/multcme.html


Hope this is helpful.


Chuan

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paolo bevilacqua Sat, 12/19/2009 - 06:36
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You probably mean CUCMBE.

It is not convenient compared to CME. It costs more, and have less features. It also requires a server while CME does not.


Please rember to rate useful posts clicking on the stars below.

kingofshadows86 Sat, 12/19/2009 - 20:39
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last Q


what do you think if I let the new CME go through old CME for using PSTN is it possible to do it


regards

paolo bevilacqua Sun, 12/20/2009 - 04:01
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As mentioned above, it is a bad solution and you should replace the router instead.

Chuan Liu Mon, 12/21/2009 - 13:22
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Yes, you can.

The old CME is connected to the PSTN, The new one connects to the old via Ethernet. You can use either SIP or H323 between the 2 CME. I have been using such a setup for 2 years. The only drawback is that you are administrating 2 systems instead of one.


Larry

Regards.

Chuan Liu Mon, 12/21/2009 - 15:21
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Hi Muhammad,


I cannot see your email address. Mine is in my profile.


What PSTN connections do you have?

In summary, it works in this way:

1. on old cme, use an outgoing voip dial-peer to direct incoming calls to new cme;

2. on the new, use an incoming voip dial-peer to receive the call and link to the ephone-dn and ephones;

3. for outgoing call from the new, use an outgoing voip dial-peer on the new to direct calls to the old cme;

4.do ext.-- ddi translations on the old cme for both incoming calls from pstn and outgoing calls to pstn.



Cheers.


Larry

Correct Answer
Chuan Liu Tue, 12/22/2009 - 11:40
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Hi,


Recommend or not all depend on your particular scenario. It is quite normal to share one or more PSTN gateways in an enterprise environment.

You have one small site and are using POTS lines for PSTN connection. How many lines do you have? It may not have enouogh capacity to handle incoming and outgoing calls for more than one CME.

Here is a link you can use for connecting multiple CME's http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/srnd/design/guide/multcme.html


Hope this is helpful.


Chuan

kingofshadows86 Tue, 12/22/2009 - 14:42
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hi,



it is really helpful thank you very much for you assistance, I will read the document carefully.

for How many lines do you have? they have 8 lines and they installed 2821 and they will buy another one same model. my be in future they will extend they phone lines if that is necessary.



I have attach you a scenario which I will apply it, if you have any suggestion please go ahead. I have explain little bit about scenario.

can you please give me you e-mail so I can contact you in future.

thank you again

regards.

paolo bevilacqua Sat, 12/19/2009 - 02:59
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Splitting extensions over two systems is a very bad design, that is not going to work well, will give you many problems and limitations.


Consequently, you have to buy the bigger router.

kingofshadows86 Mon, 12/21/2009 - 14:56
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hi,

thank you for reply mr. Chuan

This will not cause any problem

can you provide me sample of configuration if you do not mind.

can you give me you e-mail so I can communicate with you.


regards

kechengpc Wed, 12/23/2009 - 17:06
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For ISR G2 2901, the maximum registration phones is 35? Can it extend the numbers to over 35 phones with another ISR or G2?

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