Well, you have to break down how many sessions you want, etc. The DSP calc should help you. Im not sure how many PRIs you have, or FXO, etc you have the router, but in put your specs into the calc and see what you get.
Hopefully I can word this correctly, Transcoding is confusing.... not one of my favorite things.. but here it goes.
Cisco Phones phones for example can transcode calls between each other without hardware transcoding. Not until you call across to another entity that cannot handle both g.729 and g.711 would a hardware transcoder be required.
So basically if you were in Site A with an IP phone, and want to use Site B's PSTN, you would need to have a Transcoder to change from g711 to g729 and back g711 out the pstn. (hopefully I got this right, correct me if Im wrong someone)
That would be (1) session of transcoding.
PVDM2-64 supports up to 128 max sessions of Transcoding.
So in your resource list you can have the following:
xcode_routerB (on the router register xcode_routerB to CUCM)
CFB_routerB (on the router register CFB_routerB)
You will need to define the sessions for each. example:
sccp ccm group 1
associate ccm 2 priority 2
associate ccm 1 priority 1
associate profile 2 register CFB_routerB
associate profile 1 register xcode_routerB
dspfarm profile 1 transcode
maximum sessions 8
associate application SCCP
dspfarm profile 2 conference
maximum sessions 2
associate application SCCP
Create the correct MRG and Lists and you should be set to go.
When a person creates a conference call, they will use the hardware resource on the router itself (which you specified in the MRG/List). They will also have access to the transcoding sessions if needed so their local hardware is transcoding.
Im still getting the coffee rolling through me here, if Im mistaken somewhere, please correct!
Your explanation cleared it up, thanks! Our site to site calling will be plain vanilla (IP-phone to IP-phone, IP-phone to Unity which supports both codecs) so for now I'll only configure HW conf bridges. Thanks again for your help.
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