Expert Documentation

Chapter 6
DSCP
Description
56 Control
The default priority assignments are the following:
DSCP values
802.1p priority
0 - 7 0
8 - 15 1
16 - 23 2
24 - 31 3
32 - 39 4
40 - 47 5
48 - 55 6
56 - 63 7
6.7 Dimensioning
6.7.1 Detailed description
6.7.1.1 System Sizing
Information in this chapter is valid for Alcatel-Lucent OmniPCX Office Communication Server,
Release 8.1.
6.7.1.1.1 DSP Channels Required For IP Trunk Services
Number of DSPs = Number of VoIP network accesses = 48 max.
6.7.1.1.2 DSP Channels Required by VoIP Services
The number of DSP channels (VoIP ports) required depends on the system configuration and
the VoIP services to be implemented.
The most common situations are the following:
- H.323/SIP gateway only: the number of DSP channels is equal to the number of IP
network accesses.
Note:
The desired number of DSP channels can be limited by the bandwidth reserved for VoIP accesses.
Example: if the reserved bandwidth is 64 KBps, only 2 calls can be made simultaneously; the
number of VoIP accesses can thus be limited to 2 channels.
- IP Telephony only
- Conventional telephony (Reflexes / DECT / Z, etc.) and IP Telephony
- H.323/SIP gateway and IP Telephony
6.7.1.1.3 Case of DSP Channels Required With Direct RTP
6-112