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Call processing
Avaya's modem, fax, and TTY over IP support is subject to the following limitations:
QOS is required, even on LAN.
Avoid MoIP where possible (especially over a WAN environment)
Use circuit-based resources on the same gateway
Use different classes of service and restrictions
Use centralized modem pooling for larger communities
Only one TDM-to-IP-to-TDM conversion is allowed
Send duplicate streams, where practical
Table 16
summarizes Avaya's fax, modem, and TTY options.
Table 16: Fax, Modem, and TTYoIP options
Fax
Modem
TTY
98 Avaya Application Solutions IP Telephony Deployment Guide
Default, Avaya-proprietary mode, interoperates with previous
relay
releases
Proprietary mode; uses more bandwidth, fewer DSP
Pass-thru
resources
system ignores fax tones, call remains in administered codec
off
Default, system ignores modem tones, call remains in
off
administered codec
Avaya-proprietary mode, most reliable modem-over-IP mode
relay
similar to Fax pass-thru
pass-thru
Default, 45.45 Baudot, interoperates with previous releases
US
50 Baudot
UK
similar to Fax pass-thru
pass-thru
system ignores TTY tones, call remains in administered
off
codec
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