Each server type is rated to support every single extension engaged in a call providing it is direct media and regardless of security settings. If the media stream passes through the server, the capacity is reduced.
Mode |
Primary/Secondary server |
Concurrent Calls |
Direct Media |
Indirect Media |
Secure Indirect Media |
IP Office Server Edition |
Dell R260 |
750 |
128 |
64 |
Dell R660 |
2000 |
1024 |
512 |
Virtual[1] |
2000 |
1024 |
512 |
IP Office Select IP Office Subscription (Linux) |
Dell R660 |
3000 |
1024 |
512 |
Virtual[1] |
3000 |
1024 |
512 |
Assumes virtual machine profiling as detailed in "Deploying IP Office Servers as Virtual Machines".
Unless otherwise stated, R240 and R260 servers capacities are equivalent.
One VoIP call is one pair of RTP or SRTP streams between IP Office and a VoIP endpoint – for example VoIP phone, VoIP trunk, IP Office line, Voicemail Pro. Note that an indirect media call via IP Office from one VoIP endpoint to another counts as two calls; one between IP Office and endpoint A and one between IP Office and endpoint B.
Direct media is RTP/SRTP data directly between VoIP endpoints, not via IP Office. There are some IP Office networking constraints to achieve direct media. See Call Media Path (IP500 V2).
Transcoding between any codec does not reduce the server indirect media concurrent call capacity.
Direct media with SRTP does not reduce the direct media capacity.
One SRTP indirect media call reduces the available RTP call capacity by 2 (and vice versa).
If SRTP transcoding is present (for example where the security parameters are mismatched between two phones), the capacity is reduced by a further 50%.
If the server is running Voicemail Pro, one call to voicemail, attendant, recording or IVR consumes one indirect media call.
If the server is the location for an audio conference, each member consumes one indirect media call.
