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Mitel 3300 and no ring back
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Paul   Offline
Site Administrator
Switch Technician

Posts: 499
Southern Maine

Mitel 3300 and no ring back
Jan 21st, 2011 at 4:11pm
I had a customer on a Mitel 3300 with a SIP binding to our MetaSwitch indicating that a certain number of outgoing calls from their PBX did not get Ring Back before the RTP session or call connected.

After looking through the initial invite it was discovered there was no SDP(Session Description Protocol) in the invite, without which you can't have early access to media.

I had access to the config in the Mitel and in the network element settings for the SIP connection to the MetaSwitch there are SDP options, two of which are:

Enable Mitel Proprietary SDP Yes
Force sending SDP in initial Invite message No

I had the customer reverse the settings of those two options and they immediately started hearing ring back.  I looked at the initial invite messages with the new settings and now I can see SDP info being passed.
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