Mitel 5560 IPT none Specifications download pdf (Page 162)

Engineering Guidelines

148

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”)

• External Trunk Standard Ringback (Set to “Yes”)

• Return Disconnect Tone When Far End Party Clears (Set to “Yes”)

The Administrator should "enable" V.34 Fax Interop at V.17 speeds with SIP Gateways; the

factory default for this is disabled. This setting is a global setting; the setting is applied to all

ports on a system. This setting can be found under "Fax Advanced Settings"; for details see

the System Administration Tool Help for MiVoice Business.

SIP aware firewall

To secure voice communications between public Internet and devices on the private LAN the

traffic needs to traverse corporate firewalls. Session Initiation Protocol (SIP) is typically not

supported by general purpose firewalls. Conducting voice communication sessions is a complex

task for a firewall to handle. Supporting media streams transported over separate ports

negotiated during the call setup further adds to the complexity. Transparent SIP traversal

through firewalls and NATs requires specific handling of these issues.

In general, media streams are dynamically opened on a call-by-call basis using ports within a

well-defined range. As part of SIP communication sessions RTP protocol is used to carry the

voice stream. Traditional firewalls statically open certain protocols and ports in advance. This

approach creates a security exposure when port access is not controlled by the session

signalling. Instead, a firewall that understands SIP can open up the ports for the right protocols

just when the SIP traffic needs it.

The 3300 ICP supports integration with SIP Firewalls. Mitel recommends that a SIP aware

Firewall be configured as the Outbound Proxy through the Network Elements form. Then the

SIP Peer Profiles can reference the Outbound Proxy Server and route all signalling via the

Firewall.

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Mitel 5560 IPT none Specifications Page 162