Call Capacity (IP500 V2)

Last Updated : Aug 20, 2024 |

The concurrent call capacity between digital/analog extensions and/or digital/analog trunks is non-blocking. That is, all extensions and trunks can be involved in calls simultaneously. VoIP calls do not affect this capacity.

Parameters

Concurrent VoIP calls

Comment

Unsecure or Secure

Direct media

384

Calls with direct media between VoIP endpoints/trunks.

Unsecure

Indirect media, IP500 V2 VCM

120

Calls between the VoIP and digital/analog domain. Also limited by the available VCM channel capacity (see below).

Unsecure or secure

Indirect media, IP500 V2 RTP relay

120

Calls between VoIP endpoints/trunks that cannot go direct media, but do not require a VCM.

Note that a VCM channel is always required during call setup.

The value is per call leg. For example 60 H.323 extensions calling 60 H.323 extensions constitutes 120 total calls.

Secure

Indirect media, IP500 V2

40

The value is per call leg. This means 40 VCM calls or 20 indirect media calls if some SRTP settings demand decoding, then re-encoding.

If a mixed RTP/SRTP call environment, each SRTP leg removes three from the RTP call capacity.

These are not cumulative VoIP capacity figures – for example, a mixture of two call types changes the capacity to a value between the two limits. Calls that remain in the digital/analog domain do not affect this VoIP call capacity.

Administration

Concurrent call maximum capacity can be administered via IP Office Server Edition Manager in a number ways to ensure limits are not exceeded:

  • Number of Channels and Outgoing Channels setting in the Line > VoIP tab of IP Office lines

  • Max Calls per Channel setting in the Line > SIP URI tab of SIP trunks

  • Call Admission Control area of the Location settings.

  • VoIP Security area of the System settings.

  • Media Security area in the Line > VoIP Settings tab.

  • Media Security area in the Extension > VoIP tab.

The following occurs if the maximum numbers are exceeded:

Unless administered, the IP500 V2 Expansion does not limit the number of concurrent calls and makes a best effort to service all. VoIP voice quality will degrade as load increases; high overload conditions will cause the IP500 V2 Expansion to perform poorly in general.

Related information
IP500 V2 Servers