CCME and SRST

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Oct 7th, 2008
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Hi,


In a IPT solution design where the main site hosts Unified Cisco CAllManager, can we propose a CCME at the remotes sites so that it can play SRST function ? or in the case of CCME we not need to perform SRST function ?


Regards

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Rob Huffman Tue, 10/07/2008 - 06:05
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Hi Dominique,



Yes, an SRST Router at the remote sites is the recommended model. (It is a CME Router but not really called CME but rather SRST :)


Cisco Unified Survivable Remote Site Telephony Version 4.1


http://www.cisco.com/en/US/prod/collateral/voicesw/ps6788/vcallcon/ps2169/product_data_sheet0900aecd805e1e79.html



Cisco Router Using Cisco Unified Survivable Remote Site Telephony


Components of Centralized Call-Processing Architecture


The Cisco Unified Communications system uses Cisco Unified Communications Manager in combination with Cisco Unified Survivable Remote Site Telephony which is embedded within Cisco IOS® Software, to help provide high-availability IP telephony to branch offices. When access to Cisco Unified Communications Manager from the branch office is impeded, for example, as a result of a WAN link failure, Cisco Unified Survivable Remote Site Telephony provides telephony backup services to help ensure that the branch office has continuous telephony service over the Cisco network infrastructure deployed in the branch. The enhanced reliability provided by Cisco Unified Survivable Remote Site Telephony makes the Cisco Unified Communications system a cost-effective solution to ensure telephony operation to all users in an organization, whether they are located in the headquarters or in a branch office.

Furthermore, in certain environments, the security of telephony communication is a critical requirement. The Cisco Unified Communications system supports secure telephony communication between any two phones in the network, whether those phones are in the headquarters facility or at a branch office. Cisco Unified Survivable Remote Site Telephony contributes to this secure telephony communication solution by supporting the same secure telephony protocols in the branch office when the branch loses communication with the centralized Cisco Unified Communications Manager.



How It Works


Cisco developed Cisco Unified Survivable Remote Site Telephony technology for all Cisco IOS Software platforms that support voice (refer to Table 3 for a complete list). The Cisco Unified Survivable Remote Site Telephony feature integrates network intelligence into Cisco IOS Software, which acts as the call-processing engine for IP phones located in the branch office during a WAN outage.


In a centralized call-processing model, the Cisco Unified Survivable Remote Site Telephony router facilitates automatic failover so that local calls and active calls from Cisco Unified IP phones to the public switched telephone network (PSTN) are maintained even if a WAN failure occurs. If the WAN link to a remote office fails and connection to the Cisco Unified CallManager for the domain is lost, the phones in that branch office automatically redirect to the Cisco Unified Survivable Remote Site Telephony router. The Cisco Unified Survivable Remote Site Telephony router automatically takes over and offers a rich set of telephony functions to help ensure business continuity with minimal impact. When the disrupted WAN link is restored, the phones automatically reregister with the original Cisco Unified CallManager-and again, no manual intervention is required. Cisco Unified Survivable Remote Site Telephony is accomplished through this integrated system with no additional hardware components



http://www.cisco.com/en/US/prod/collateral/voicesw/ps6788/vcallcon/ps2169/product_data_sheet0900aecd805e1e79.html



Hope this helps!

Rob

dom.a Tue, 10/07/2008 - 06:42
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In fact, my case is related to 4 four main sites, each with at least 4 remotes sites connected to it.


My design is :

- UCM + Unity + gateway + gatekeeper for main site

- CCME on remote sites

- gateways, CCME and gatekeeper are connected to both PSTN and IP WAN.


Does it going to work like this ?


Regards

Rob Huffman Wed, 10/08/2008 - 05:01
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Hi Dominique,



Sorry for the delay in getting back to you :) This does sound like the type of model where SRST would be a good fit, but we would need to look "in depth" with a design engineer to work out all the details.


Rob

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