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88 4600 Series IP Telephone LAN Administrator Guide
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:
Table 5: Parameters in Real-Time
Parameter Possible Values
Audio Connection
Present?
Yes if a receive RTP stream was established.
No if a receive RTP stream was not established.
Received Audio
Coding
G.711, G.726A, or G.729.
Silence Suppression Yes if the telephone knows the far-end has silence suppression
Enabled.
No if the telephone knows the far-end has silence suppression
Disabled, or the telephone does not know either way.
Packet Loss No data or a decimal percentage. Late and out-of-sequence packets
are counted as lost if they are discarded. Packets are not counted as
lost until a subsequent packet is received and the loss confirmed by
the RTP sequence number.
Packetization Delay No data or an integer number of milliseconds. The number reflects the
amount of delay in received audio packets, and includes any
look-ahead delay associated with the codec.
One-way Network
Delay
No data or an integer number of milliseconds. The number is one-half
the value RTCP computes for the round-trip delay.
Network Jitter
Compensation Delay
No data or an integer number of milliseconds reporting the average
delay introduced by the telephone’s jitter buffer.