Question on Local calls for Call Manager deployment across states: Planning

[johnramz]

we have 3 sites:

Colorado Office area code: 303

California Office area code: 714

Illinois Office: area code: 630

Our DataCenter in Texas: area code: 214

Currently each site has Nortel systems with a PRI DIDs for each one of the Offices.

Network connectity: MPLS VPN for offices and DataCenter

GOALS:

- To deploy Call Manager Server at Data Center and extend it to offices.

- Keep same area codes for all offices

QUESTIONS:

How to keep same are codes if all current PRI circuits at offices would be disconnected and the CM server would centralize all connectiviy from Phone providers?

Is it possible to to have 714 area code phone numbers for California Office in our Texas DataCenter?

If someone takes the time to explain it to me in overview and as much details as considered necessary

Thanks

John

[Chris Deren · Accepted solution]

If you are centralizing your trunking then your only option to have local DIDs is to implement SIP trunking vs. PRI circuits. PRIs connect to central local offices and can only deliver local DIDs.  SIP trunk on the other hand can deliver any numbers. SIP trunks are the facto services these days anyway and besides this type of benfit you will see many others including cost savings.  Keep in mind that for SIP trunking Cisco recommends deployment of Border Element (CUBE) which are simply Cisco gateways (routers) with RTU CUBE licenses.

HTH,

Chris

[johnramz]

Chris,

Do you know of an online CISCO resource/document that talks about SIP trunks and CISCO gateways for this type of deployment,

Thanks for your quick reply

John

[Chris Deren]

The best source is CUCM SRND:

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_implementation_design_guides_list.html

which discusses SIP trunking in detail, but there are lots of white papers out there and major service providers i.e. AT&T, Verizon, Level3, XO, CenturyLink, Sprint all have these available, just search their sites.

HTH, please rate all useful posts!

Chris

[johnramz]

Thanks Chris for taking your time to reply.