Telephony
Maximum number of concurrent calls : 880
Maximum number of extensions : unlimited extensions
Maximum number of built in analog ports : 32
Number of E1 / T1 ports : 4 (up to 120 concurren 4 calls)
Maximum modules supported internally : 4 (additional Xstack gateway ports are supported )
Maximum number of telephony ports : 144 (4xE1 PRI/R2/CAS /R2/CAS + 24 analog ports)
