Centralizing CME

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Jul 7th, 2008
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Hi all,


I have two offices which I want to share the CME. Is it possible to centralize the CME so that I can register the IP phones for both offices in one CME?

Correct Answer by paolo bevilacqua about 8 years 10 months ago

Yes. You can control phones in any location with a single CME.


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Correct Answer
paolo bevilacqua Mon, 07/07/2008 - 00:52
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Yes. You can control phones in any location with a single CME.


Please rate post if it helps!

paolo bevilacqua Mon, 07/07/2008 - 02:06
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Thanks for the appreciation and good luck!

dhccoid.com Mon, 07/07/2008 - 04:36
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Just be aware of the following restrictions.


Remote SCCP Phone Support Restrictions

Remote skinny client control protocol (SCCP) phones connected across WAN links are subject to the following restrictions:

• Cisco TAC will not handle any voice or signaling issues for remote IP phones, unless the same issue can be replicated for LAN phones.

• E911 or emergency calls are not supported from remote IP phones.

• All calls made to and from remote IP phones must use G.711. Cisco Unified CME does not support the ability to specify G.729 codec for remote IP phones.

• For inbound or outbound calls, remote IP phones cannot fail and go over to a PSTN connection.

Remote phones must use the WAN for all calls, even if available bandwidth is not sufficient to guarantee voice quality.

• Remote IP phones do not support Network Address Translation (NAT). All Cisco Unified CME phones must use IP addresses that are can be routed to and from Cisco Unified CME. Remote IP phones must be able to access the IP addresses that are used for all other local and remote phones.

• All PSTN access is through the central site only. PSTN termination at the remote site is not supported.

• Cisco Unified CME does not support Call Admission Control (CAC) for remote SCCP phones, so voice quality can degrade if a WAN link is oversubscribed. High-bandwidth data applications used over a WAN can cause degradation of voice quality for remote IP phones.

paolo bevilacqua Mon, 07/07/2008 - 05:01
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In the above, the following point is not correct about remote phones:


• All calls made to and from remote IP phones must use G.711. Cisco Unified CME does not support the ability to specify G.729 codec for remote IP phones.


In fact, remote phones can use g.729, with or without the assistance of dspfarm transcoding where communications with g.711 endpoints is necessary (For example, CUE).

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