Page 474 of 910 Configuration of IP Telephony nodes using OTM 2.2
553-3001-365 Standard 4.00 August 2005
2Click the Codec Options sub-tab. See Figure 150 on page 476.
Up to four codecs can be selected.
Note: The T.38 Fax and G.711 Clear Channel Fax codecs are not
counted in this limit.
The G.711 codec type is mandatory and is automatically selected.
Voice activity detection
threshold
–20 to +10 dB –17 dB
Enable V.25 FAX/Modem
tone detection
checked or unchecked checked
Enable V.21 FAX tone
detection
checked or unchecked checked
FAX maximum rate 2400, 4800, 7200, 9600,
12000, 14400 bps
14400 bps
FAX playout nominal delay 0 – 300 ms 100 ms
FAX no activity timeout 10 – 32000 seconds 20 seconds
FAX packet size 20 – 48 bytes 30 bytes

Recommendation

Nortel recommends that the system be configured with both G.711 and
G.729A if there is a possibility that 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.)
For more information, refer to IP Phones: Description, Installation, and
Operation (553-3001-368) in the “Select Sound Devices tab” section.
Table 71
DSP parameters (Part 2 of 2)
Parameter Range Default value