Mitel 5560 IPT none Specifications download pdf (Page 161)

IP Networking

147

Applications compatibility

To ensure applications compatibility with an ICP that is using SIP trunking, the System

Administrator needs to ensure that all applications that use MiAudio or emulate a MiNET phone

are upgraded to versions that support RFC 4733. SDK version 2.0 supports RFC 4733.

RFC 4733, RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals is an IETF

memo that describes how to carry DTMF signalling, other tone signals, and telephony events

in RTP packets.

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 262 and

“T.38 FoIP Guidelines” on page 263.

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’.

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Mitel 5560 IPT none Specifications Page 161