Switching Between Early Media And Local Ringing; Configurable Codec Negotiation Behavior - Mitel 6867i Administrator's Manual

Mitel 6800 Series SIP Phone Release 4.2.0 Administrator Guide

SWITCHING BETWEEN EARLY MEDIA AND LOCAL RINGING

The phone supports switching between early media and local ring tone. Upon receiving a 180
response, the phone 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"

CONFIGURABLE CODEC NEGOTIATION BEHAVIOR

By default, when the phone receives an SDP Offer with several codecs defined for the media
stream, the phone will reply with an SDP Answer containing all the codecs present in the Offer
(as per RFC 3264).
A configuration parameter ("sip single codec reply in sdp") is available that allows
Administrators to change the phone's codec negotiation behavior so that the phone will indicate
only one preferred codec in the SDP when replying to an SDP offer (as per 3GPP TS 24.229).
Defining the "sip single codec reply in sdp" as "0" (disabled) will maintain the default behavior
of the phone (as per RFC3264). Defining the "sip single codec reply in sdp" as "1" (enabled)
will change the phone's behavior to indicate only one preferred codec (as per 3GPP TS 24.229).
Note: The first codec on the compatible codecs list will be selected as the single preferred
codec when the "sip single codec reply in sdp" parameter is enabled.
CONFIGURING CODEC NEGOTIATION BEHAVIOR
Use the following procedure to configure codec negotiation behavior:
CONFIGURATION FILES
For the specific parameter you can set in the configuration files, see Appendix A, the section,
"Codec Negotiation Behavior"
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