Aastra has a broken SCA implementation.  We have been working with them to resolve it but as of yet they have failed to deliver a working firmware for their phones.

Mike

On Apr 30, 2010, at 10:07 PM, Mark Maly wrote:

Hi,
 
I’ve tried to patiently figure this out by reading the wiki and this list.  Unfortunately, I’ve been unable to get it right. 
 
I have 2 Aastra 6731is and a 51i and trying to get SCA working.  I’m experiencing problems similar to the Cisco thread from last month – outgoing calls implement SCA well.  Incoming calls ring all lines and appearances work, but when one phone is answered, the line appearances are removed from the remaining phones.  I am not attempting to use any DNS.
 
My configuration has all three phones plus FS on a local LAN.  Nothing too fancy.  Each line is configured for Broadsoft SCA and SCA bridging  is enabled globally for the phones.
 
Trying to update/replace an old phone at my church.