dsp question

[iptuser]

I have a couple of questions


If you have a remote site using SRST with G711 as the local codec connected to the main Cluster across the WAN

Set up - Only call control, at the moment , is sent across the WAN back to the main Cluster,all PSTN is out local , RTP is only lcoal between the office IPT phones, SRST router has it`s own E1 connection, all handsets use G711, Voice Mail is via a dedicated TDM system. Question -Do you require any additional DSP`s on the actual SRST router for conferencing for example, can the handsets handle it themselves or can they use the conference capability at the main cluster across the WAN- both HW/ and S/W

If you can use the Cluster conference capability - Where do the RTP streams get mixed in the Cluster across teh WAN? Does the mixed RTP stream get sent across the WAN back from the Cluster?

Same set up above but now you can have calls cross the WAN

many thanks

 

[ptdog]

The things that worked out for my design is to also create conferencinng resources on the SRST router with the extra DSPs. The mixing gets done locally and will not need to go over the WAN. The other benefits is Meet-me resources is now locally also.

Conferencing will be hindered if you specify only G729 across the WAN to save bandwidth. The software resource in Callmanager is only G711. Local resources will help this out.