Customer has multiple location, and currently is on Centerex (Nortel DMS 100) maintained
by PSTN Qwest, and the also have NEC PBXs and Norstar PBXs.
We will be installing Unity to replace one of their existing VoiceMail systems supporting
8,500 mailboxes. we will be integrating Unity Via PIMGs.
In few months, customer will be moving 3000 users to a New building, and would like to go
with Cisco IP Telephony Call Manager Solution.
Qwest will be their PSTN Provider to support the New Building's phone services. Few Questions
1) They want to keep thier existing Dial Plan for the new building which is 5 digits and reach
other phones on different locations (such as Centerex) by dialing 5 digits.
2) I know it is workable for IP to IP, Having Centralized Call Manager and branches IP Phones will be connected over IP WAN backbone, but not sure if it would work between Call Manager and user on remote location will be on Centerex Services.
3) Can those new users be part of the Main Unity Server which will be already in place as I mentioned above.
My solution would be to connect Call Manager in a new building to Unity Server in Old
building over WAN. Note: Unity has already connected to PBXs in Headquarter with PIMGs. Can Unity Service multiple Phone Systems such as Legacy PBXs and a Call Manager in a new building.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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