SME?

[iptuser55]

I need some info on SME's, why are they used. I understand that they are there to simplify dial plans, trunks, applications such as voice mail but so can a cube for telephony or another cucm. If you have a good dial design ie cucm A has site codes, prefix 43,222,56 etc and cucm B 44,86,589 etc then changes in cucm or new sites as well as they are within 43,222,56 then cucm B doesn't have  to be updated.

Is the true reason based upon gdpr updates, alternative +e164 updates, centralised resources? 

My understanding of gdpr is that you configure what numbers can be replicated out which include internal DN's, alternative DN and alternative  e164. you assign a PT to any inbound updates and the make sure the PT is assigned to a user's Css so the learnt DN's can be dialled as in PSTN fail over

Thanks 

[Manish Gogna]

Hi,

Please check my reply in the following post

https://supportforums.cisco.com/t5/ip-telephony/difference-between-cucm-vs-cucm-sme/td-p/2942137

Manish

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[iptuser55]

Thanks for your reply however Im after real life examples not a SRND version. I`m aware of SIP trunks, 3rd party etc but why do people have it and not just say use a Cube for centralized dial plan, combined SIP trunks etc

[Mohammed al Baqari]

Hi,

SME is mainly used in large deployments not 2 clusters example.

Also, CUCM can perform features that can't be done in CUBE. For example,
you can't customize location CAC in CUBE as you can do in CUCM. Another
example, CUBE rewrite lot of headers in SIP messages to indicate its local
identity and secure the calling party. This can be impact lot of things
like caller ID display or actual call routing especially if you use URI
dialing. You can fix this in CUBE but it needs lot of efforts and
configurations. In CUCM this works seamlessly by default.

These are two examples on top of my head but you can use same comparison
for other features.