Mitel 3300ICP / MCD 6 - SIP Call Transfers Fail

[SIPLab]

I have multiple Standard SIP phones that I am testing Transfer function on, and for some reason, as soon as the transfer occurs, they hang up on each other and connection is broken.

I've looked at SIP Device Capabilities
Tried SIP Device Based and Mitel System Based, but no luck...I would blame the phone, but several brands of SIP phones are failing.

Has anyone else experienced this? Any configuration "gotchas" that are well known out there?

Thanks and regards

Ed

 

[bobcheese]

try changing the option 'force sending SDP in initial invite message'

 

[bobcheese]

Also, are the SIP phones you are using in the SIP CoE list as certified compatible? If so have you followed the guide on configuration?

 

[SIPLab]

Thanks for the tips...working on development side, so the phone I'm most concerned with hasn't been interopped yet with Mitel's CoE...the other is a Grandstream GXP 1405

The Mitel testbed switch has been configured by the application notes, but most of the phones we've tested against them don't support transfer.

I tried changing the force SDP setting, but no luck there either.

 

[bobcheese]

Can you provide a wireshark trace?

 

[SIPLab]

Thanks for looking...attached are a PCAP of 1006 calling 1009 and attempting a Transfer to 1008

SIP Device capabilities screenshots as well. in a ZIP

 

[sarond]

Make sure you set a multicall key on the sip device as the same extension.

 

[SIPLab]

Hmmm...multicall on all three sets or just the transferring station? Thanks for that insight.

 

[SIPLab]

Here is a link to a new capture with all phones having a multicall key

http://filebin.ca/1NIiKXhR4avl

 

[sarond]

Multicall on the SIP device that needs to transfer. It should be the same as its own extension number. It is like a second intercom/line for the sip device to enable it to transfer.