TB30s SIP Administrator Guide v1.3 Page 204 of 259
Early Media Type parameter
Regarding Early media and RTP, policy so far was: 18x with sdp triggers RTP
to be played, whereas 180 ringing without sdp triggers local ringing signal
generation.
Some systems however have been found with call flows incompatible with
this policy.
For this reason, a parameter has been created in order to decide whether a
180Ringing will generate local ringing or will continue playing RTP previously
negotiated in the early session.
New parameter is Earlymediatype. See below in order to know how to
configure it.
Feature Activation
This parameter can be configured using APS through common and MAC
config files, where you can find Earlymediatype in section [sip]. It can be
also modified via telnet using command sip set early_media_type.
Default value is 0. That means phone will switch to local ring tone if it
receives a 180 Ringing (no sdp) response, regardless if an RTP stream
corresponding to the early media session is present.
Setting Earlymediatype parameter to 1, phone will continue playing RTP
stream corresponding to the early media session even if a 180 Ringing (no
sdp) response is received.
[sip]
...
Earltmediatype=0 (switch to local ringing generation
if 180 (no sdp) is received)
...
Or
[sip]
...
Earlymediatype=1 (do not switch to local ringing if 180 (no sdp) is
received, and still playing the incomming RTP pkg)
...
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