Hi Benjamin
thanks a lot for your complete response
first of all, I think when we wanna eliminate Mobile Switching Centers and 
transmit subscribers multimedia data ( voice calls and etc) by packet switches 
rather than circuit switch, we MUST provide some degrees of QoS for the 
connection. base on 3gpp standard, IMS used diffserv and mpls to provide QoS 
for users based on type of connection (conversational, streaming, interactive & 
background) and based on user’s charging  type(Gold, Silver …). I don’s see 
anything about diffserv and mpls in cw docs.


secondly, we’re gonna deploy CW IMS for university(Isfahan University of 
Technology) and there must be some reasons (like QoS) to prefer CW IMS to some 
VOIP servers like Freeswitch.

thirdly, we have implemented EPC by Open Air Interface open source and we’re 
gonna connect CW IMS to it but as you now, Metaswitch Perimeta is not open 
source, so we’re looking for an alternative. It seems that you know how we can 
overcome this problem (eg. an alternative open source)
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