Channel Capacity - AudioCodes Mediant 4000 SBC User Manual

User's Manual
61

Channel Capacity

The following table lists maximum concurrent SIP signaling sessions, concurrent media
sessions, and registered users.
Table 61-1: Maximum Signaling, Media Sessions and Registered Users
Product
Mediant 4000 SBC
Mediant 4000B SBC
Notes:
•
•
•
•
•
•
•
•
Version 7.2
Signaling Capacity
Registered Users
SIP Sessions
5,000 20,000
5,000 20,000
The figures listed in the table are accurate at the time of publication of this document.
However, these figures may change due to a later software update. For the latest
figures, please contact your AudioCodes sales representative.
"GW" refers to Gateway functionality.
The "SIP Sessions" column displays the maximum concurrent signaling sessions for
both SBC and Gateway (when applicable). Whenever signaling sessions is above the
maximum media sessions, the rest of the signaling sessions can be used for Direct
Media.
The "Session Type" column refers to Gateway-only sessions, SBC-only sessions, or
Hybrid sessions which is any mixture of SBC and Gateway sessions under the
limitations of Gateway-only or SBC-only maximum values.
The "RTP Sessions" column displays the maximum concurrent RTP sessions when
all sessions are RTP-RTP (for SBC sessions) or TDM-RTP (for Gateway sessions).
The "SRTP Sessions" column displays the maximum concurrent SRTP sessions
when all sessions are RTP-SRTP (for SBC sessions) or TDM-SRTP (for Gateway
sessions).
The "Registered Users" column displays the maximum number of users that can be
registered with the device. This applies to the supported application (SBC or CRP).
Regarding signaling, media, and transcoding session resources:
√
A signaling session is a SIP dialog session between two SIP entities, traversing
the SBC and using one signaling session resource.
√
A media session is an audio (RTP or SRTP), fax (T.38), or video session
between two SIP entities, traversing the SBC and using one media session
resource.
√
A gateway session (i.e. TDM-RTP or TDM-SRTP) is also considered as a
media session for the calculation of media sessions. In other words, the
maximum Media Sessions specified in the table refer to the sum of Gateway
and SBC sessions.
√
In case of direct media (i.e., Anti-tromboning / Non-Media Anchoring), where
only SIP signaling traverses the SBC and media flows directly between the SIP
entities, only a signaling session resource is used. Thus, for products with a
greater signaling session capacity than media, even when media session
resources have been exhausted, additional signaling sessions can still be
handled for direct-media calls.
√
For call sessions requiring transcoding, one transcoding session resource is
also used. For example, for a non-direct media call in which one leg uses
G.711 and the other leg G.729, one signaling resource, one media session
Session Type RTP Sessions
SBC-Only 5,000
SBC-Only 5,000
923
61. Channel Capacity
Media Sessions
SRTP
Sessions
3,000
5,000
Mediant 4000 SBC
Detailed Media
Capabilities
Table 61-2
Table 61-3