guess It is the B's function, B is able to put the call in waiting instead of respond 486 to FS, when B is already a call with another party.
in this case, I'm afraid FS will have no idea about what is happening in B.
what branch B is? did you try B's role with another phone?

rgds,

Loi Dang Thanh
Phone : +84.1224.735.448
Email : loi.dangthanh@gmail.com

On Wed, Dec 21, 2016 at 3:40 PM, Bipin Patel <bipin@xbipin.com> wrote:
hi,

i have been using FS in product on many raspberry pi's and other machines in PBX environment and everything works well except im stuck with a requirement which i cant seem to be able to get over.

party A calls party B but party B is already in call with party C, so party A gets normal ringtone and party B gets call waiting beeps, how do we detect in FS that party B is already busy on another call and generate a different ringtone for party A which he hears so indirectly party A knows that party B is already on another call?


--
Regards,
Bipin




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