QoS
Issue 6 February 2007 87
encodings that do not terminate in 000. The specific treatment intended by these custom
DSCPs will not necessarily be carried out by routers outside the customer’s own network.
The 4600 Series IP Telephone Installation Guide describes the Local Administrative Option for
QoS. This option allows you to specify Diffserv values for Layer 3 audio (“DSCPAUD”) and
signaling traffic (“DSCPSIG”) on a telephone-by-telephone basis.
The Avaya H.323 IP Telephones’ DiffServ values change to the values administered on the
media server as soon as the telephone registers. For more information, see the document titled
Administration for Network Connectivity (555-233-504kk). Unless there is a specific need in
your enterprise LAN, we do not recommend you change the default values.
UDP Port Selection (H.323 Only)
Some data networks include equipment that can perform UDP port selection. This is a
mechanism that gives packets with port numbers in a given range priority over packets with port
numbers outside that range.
To support UDP port selection, the 4600 Series IP Telephones can be administered from the
Avaya Communication Manager Network Region form. Locate specific implementation details
for local administration of MCPORT in the 4600 Series IP Telephone Installation Guide. For
Avaya Communication Manager administration, find implementation details in Administration for
Network Connectivity for Avaya Communication Manager Software. In summary, the system
value MCPORT represents the port on the TN2302AP circuit pack. Use this port number to
administer routers, etc. supporting UDP port selection, to maximize priority of voice packets
being exchanged between the PBX and the telephone.
The default value for MCPORT is 1719. Administer the switch to use a port within the proper
range for the specific LAN, and the IP telephone(s) will copy that port. A related parameter is
PORTAUD, which is the RTP port used by the switch. If no UDP port range is administered on
the switch, the IP telephone uses an even-numbered port, randomly selected from the interval
4000 to 10000.
Network Audio Quality Display on 4600 Series IP Telephones
With the exceptions of the 4601, 4601+, 4606, 4612, 4624, and 4690 IP Telephones, all Series
4600 IP Telephones are by default administered to allow the end user an opportunity to monitor
network audio performance while on a call. The user guides for each telephone provide specific
detail on getting to the appropriate screen, what the end user sees, and what the information
means.
For 4610SW/4620/4620SW/4621SW/4622SW/4625SW/4630/4630SW IP Telephones, these
parameters display in real-time to users on the appropriate screens, while on a call:
