Robert Hajime Lanning wrote:
John,
   Jared is right.  I have a co-worker who has coughed up the money for the
Cisco 7960 SIP phones.  These have a soft button for "Supervised Transfer".
And, it works.

   I only have the Grandstream BT101 phones, and their "Transfer" button only
implements "Blind Transfer".

   So, to get it to work, you will need to upgrade to non-budget phones.  Not
ideal, but Asterisk does support the feature, just Grandstream does not.

Out of curiosity: Could you explain the difference from a SIP protocol level?

/O

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