Installation Manual for digital sets - IP sets - SIP sets AMT/PTD/TR/0001/3/7/EN
SIP PHONES 51i, 53i, 55i AND 57i 05/2008 Page 9-63
9.12.10 QOS on the IP network
The SIP phones can mark ToIP frames according to their type (signalling, RTP, RTCP) on level 2
(802.1Q) and on level 3 (DiffServ).
They can also assign a level 2 priority to traffic from the connected PC.
Therefore, level 2 devices do not have to modify the marking of traffic from the SIP phone, unless
there is an inbound-traffic-analysis and traffic-remarking policy.
On level 3, you only have to activate DiffServ in the devices to take account of the ToIP frame
marking.
The standard QoS recommendations are:
• Priority level 2 ToIP (signaling, RTP/RTCP)=6
• Priority level 2 Data=0
• Priority level 3 ToIP=B8h
• Priority level 3 Data=00h
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