IP Address

Default = 0.0.0.0

The IP address of the phone. If an address is entered, the IP Office only accept registration from a device with that address.

Reserve License

Default = None.

Avaya IP phones require an Avaya IP Endpoint license, non-Avaya IP phones require an 3rd Party IP Endpoint license. Normally the IP Office issues licenses in the order that devices register. This option allows this extension to be pre-licensed before the device registers. This can prevent a previously licensed phone becoming unlicensed following a system restart. The options are:

Note:

VoIP Silence Suppression

Default = Off

When enabled, when the IP Office detects silence during an IP call, it does not send any audio data.

Fax Transport:

Default = Off.

This option is only available if Re-Invite Supported is selected. When enabled, the system performs fax tone detection on calls routed via the line and, if fax tone is detected, renegotiates the call codec as configured below. The SIP line provider must support the selected fax method and Re-Invite.

For systems in a network, fax relay is supported for fax calls between the systems.

The options are:

DTMF Transport

Default = RFC2833.

This setting is used to select the method by which DTMF key presses are signalled to the remote end. The supported options are In Band, RFC2833 or Info.

Requires DTMF

Default = Off.

This field is displayed when System SettingsSystemVoIPIgnore DTMF Mismatch for Phones is set to On. It can be used to allow direct media connections between devices despite the devices having differing DTMF setting.

When Requires DTMF is set to Off, during the checks for direct media, the system ignores the DTMF checks if the call is between two VoIP phones. Set to On if the extension needs to receive DTMF signals.

SIP endpoints using simultaneous login, which do not have physical extensions in the configuration, are treated by the system as not requiring DTMF.

Local Hold Music

Default = Off.

When enabled, the extension plays local music when on HOLD.

If System SettingsLineAdd/Edit Trunk LineSIP LineSIP AdvancedLocal Hold Music is enabled, the extension Local Hold Music must be disabled to play far end music to the extension.

Allow Direct Media Path

Default = On

This settings controls whether calls between IP endpoints and/or lines must go through the IP Office.

VoIP Silence Suppression

Default = Off

When enabled, when the IP Office detects silence during an IP call, it does not send any audio data.

Codec Lockdown

Default = Off.

After a SIP offer with a list of codecs, the IP Office expects an SDP answer with a single codec selected from that list. However, some SIP user agents send an SDP answer with multiple codecs. Those user agents then expect to switch to any of the codecs during the call without further negotiation. IP Office does not support this and loss of speech path will occurs if the user agent changes codec without renegotiating.

3rd Party Auto Answer

Default = None.

This setting applies to 3rd party standard SIP extensions. The options are:

Media Security

Default = Same as System.

These settings control whether SRTP is used for this extension and the settings used for the SRTP. The options are:

Codec Selection

Default = System Default

Set the supported codecs. Where possible, Avaya recommend that you use the same set of codecs for all IP Office systems, lines, and extensions.

The options are: