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Conecting PABX behind 2901 between HQ to branch

I am newbie here.

My client has 2901 with E&M and E1 card.

They have 5 branches.

Each branch has NEC NEAX 2000 IVS PABX and Analog phone.

Here the diagram based on client description

Analog Phone -> PABX -> E1 -> 2901 -> WAN -> 2901 -> E&M -> E&M->PABX -> Analog Phone

 

QUESTIONS:

1. Should I follow this sample config

http://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/cucme/pbx/interop/notes/248500ne.pdf

2. What protocol should I use between 2901? H323, G711 or G729

3. What's the function of E&M card there. I know one of E&M card function is to have streaming music.

4. Should I use 32channel PVDM

5. If I use 64channel PVDM. What protocol should I use to get 64 concurrent call

6. I have my own lab with 2 pieces 2811+FXS+FXO+E1/T1.

Can I simulate E1 connection between 2 pcs of 2811

 

thanks

 

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