Aastra Telecom 41-001343-02 manual Early-Only Parameter in Replaces Header RFC3891

Advanced Operational Features

Enabling/Disabling “Out of Order SIP Requests”

Use the following procedure to enable/disable “out of order SIP requests”.

Configuration Files

For the specific parameter you can set in the configuration files, see Appendix A, the section, “Ignore Out of Order SIP Requests” on page A-212.

“Early-Only” Parameter in Replaces Header RFC3891

The phones support the “early-only” parameter in the “Replaces” header as referenced in RFC3891. When the phone receives a Replaces header with the early-only parameter, it replaces the existing dialog if the call is still in the early state. If the call has been answered, then the Replaces request is rejected.

Note:

This feature is not supported in outgoing requests.

Switching Between Early Media and Local Ringing

Previous to release 2.6, the phone generated a local ring tone when receiving a 180 response unless early media was being played, regardless of SDP. The local ring tone stopped when the first RTP packet was received in the early session. The local ring tone did not resume when it received subsequent 180 responses, even though early media was not being received.

In Release 2.6 and up, the phone supports switching between early media and local ring tone. Upon receiving a 180 response, the phone now generates a local ring tone unless it is receiving an early media flow. If the phone receives any subsequent 180 responses, it regenerates the local ring tone unless it is receiving early media flow.

Enable Microphone During Early Media

The phones now allow Administrators to enable or disable the microphone during early media by configuring the “sip early media mute mic” parameter. Early media indicates the period when a call has not fully established (i.e. the far end has not answered the call). By enabling this parameter, Administrators can mute the microphone during early media to prevent the far end from listening into the call prior to answering it.

Enabling/Disabling “Microphone During Early Media”

Use the following procedure to enable/disable “microphone during early media:

Configuration Files

For the specific parameter you can set in the configuration files, see Appendix A, the section, “Enable Microphone During Early Media” on page A-147.

“Call-Info” Header to 200ok Responses for Shared Call Appearance (SCA) Lines

In earlier versions of the IP phone software releases, a "Call-Info" header was only added to the requests generated by the phone for Shared Call Appearance (SCA) lines. A “Call-Info” header ia now also included in the 200ok response to an INVITE, RE-INVITE, and UPDATE messages for SCA lines. No configuration is required for this feature.

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