Mitel MiVOICE BUSINESS, Engineering Manualline

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IP Networking
149
THIRD-PARTY PHONE COMPATIBILITY
DeTeWe and SpectraLink sets support RFC 4733, NAT keep-alives, and utilize a single port
for transmit and receive streams. As a result, these sets are compatible with an ICP that is
using SIP trunking.
SUPPORT FOR FAX OVER IP
When using SIP trunks to connect the 3300 ICP to the service provider, G.711 FAX pass through
and T.38 Fax over IP are both supported.
When the ICP detects a FAX calling tone or a V.21 tone, if both the ICP and the Service Provider
support T.38 capability, then the ICP will disable the echo canceller and the call will proceed
as a T.38 call. However if the FAX is to be transported via G.711 pass through, then the ICP
will leave the echo canceller on the line and a Jitter buffer designed for Fax pass through will
be enabled.
For network guidelines see “G.711 Fax pass through performance guidelines” on page 265 and
“T.38 FoIP Guidelines” on page 267.
Class of Service (COS) options
For software releases prior to Release MCD 5.0 SP2
For correct operation, ports that are used to connect to Fax machines should have the following
COS options enabled:
• Campon Tone Security/FAX Machine (Set to “Yes”)
• Busy Override Security (Set to “Yes”)
• External Trunk Standard Ringback (Set to “Yes”)
• Return Disconnect Tone When Far End Party Clears (Set to “Yes”)
For software Release MCD 5.0 SP2 and greater
For Release MCD 5.0 SP2 a new option called ‘Fax Capable’ has been added in the ‘Class of
Service Options’ form. This new option is located under the ‘Fax’ heading. Another change
introduced in MCD 5.0 SP2 is the renaming of the ‘Campon Tone Security/Fax Machine’ option
to ‘Campon Tone Security’.
For correct operation, ports that are used to connect to Fax machines must have the following
COS option enabled:
• Fax Capable (Set to “Yes”)
In addition to the Fax Capable COS option, the Administrator is advised to set the following
COS options as indicated. If some of these overrides are not set as indicated and a tone is
generated on this port while a Fax transmission is in progress, then the Fax transmission will
likely fail.
• Campon Tone Security (Set to “Yes”)
• Busy Override Security (Set to “Yes”)