Hi i'm looking for a little clarification on an idea of mine if you don't mind.
We have a CME4.3 system up and running here on a 2801 and its doing just fine but i now have a requirement for a semi-isolated system in a lab enviroment that is going to require me to remove the phones in the lab's from the system but still give them voice connectivity, i am thinking about using a 2621XM that's spare from when we upgraded the systems as a CME router in that enviroment then setting up a link between the routers for voice traffic.
Having never setup a VoIP connection before i'm in need of some assistance with DSP's, can any of you confim that the DSP's in the routers are involved in CME-CME connections and that's just the way it is you can't get around it or is it possible to get a connection going without DSP rescources in the one router, the PSTN connection will be via the 2801 so i don't need the ability to connect VIC's to the lab unit or anything like that.
If DSP's are required in both i have a good case for investing in another 2800 series device but being a small company and also right in the middle of a new 2960 PoE rollout i'm looking for ways to keep the costs down.
P.S Please excuse any spelling errors its been a long day.
For CME to CME communication no DSPs would be needed. If your solution involves using voip dial-peers to allow communication between the two CME routers, the phones should handle communication between each other just fine.
You would need DSP's if:
- You require voice termination with analog or digital voice interfaces such as FXO, FXS, or PRI interfaces
- You require conferencing or transcoding
So if the lab router does not have any PSTN connection you would be fine.
The CME SRND also has a chapter dedicated to connecting multiple CME sites.
Hope this helps.