Configuration of IP Telephony nodes using Element Manager Page 381 of 910
IP Line Description, Installation and Maintenance
c. Voice activity detection threshold: The default value is –17db. The
range is –20db to +10db.
d. Idle noise level: The default value is –65db. The range is –327db to
+327db.
e. DTMF Tone detection: Ensure this is checked to enable DTMF tone
detection. This is enabled by default.
f. Enable V.21 FAX tone detection: Ensure this is checked to enable
V.21 FAX tone detection. This is enabled by default.
g. FAX maximum rate: The FAX maximum rate is one of the following
values: 2400, 4800, 7200, 9600, 12000, or 14400. The default value
is 14400 bps.
h. FAX playout nominal delay: The default value is 100 ms. The range
is 0ms to 300ms.
i. FAX no activity timeout: The default value is 20 seconds. The
range is 10 seconds to 32000 seconds.
j. FAX packet size: Select the desired FAX packet size. The default
value is 30 bytes. The range is 20 to 48 bytes.
To select a codec, scroll through the list, and click the corresponding
Select check box. See Figure 89 on page 382 for codec samples. A
maximum of four codecs can be selected.
Recommendation
Nortel recommends that the system be configured with both G.711 and
G.729A if there is a possibility that an IP Softphone 2050 could be
configured with the “I use a modem to connect to the network” check box
checked. If the node does not have G.729A and/or G.723 configured, IP
Softphone 2050 users with that checkbox selected will have calls
blocked.
(Note: This does not apply to the MVC 2050 as it only supports G.711
capability; there is no dial-up capability.)
For more information, refer to IP Phones: Description, Installation, and
Operation (553-3001-368) in the “Select Sound Devices tab” section.