VoIP to VoIP is simple enough if you use the Quintum Call Relay – it has been designed specifically for this type of environment.
The benefit of the Call Relay is that it just forwards the packets on without the messy decoding and recoding of the voice. As Noname states this is something to be avoided as much as possible as the voice will degrade every time you go through this process.
There are two Call Relays on the market – the basic system starts at sixteen simultaneous calls and can be upgraded to thirty. The second unit is the Call Relay SP (Service Provider) this starts at 120 simultaneous calls and can be upgraded to 720.
We run the SP unit ourselves as well as installing it for a number of customers – it runs very well and is very low maintenance.
I hope you will find this information useful – if you need any other pointers please feel free to contact me at: mhitchcock@blue-lava.co.uk