[Freeswitch-users] transfer_ringback triggered by "183 Session progress"

[Irina Ivanova]

Hi,

I've noticed that if to set transfer_ringback (to any ringback tone) for 
already answered call and then to execute the bridge to some external 
number through the gateway, the ringing is triggered not only by "180 
Ringing" SIP response, but also when "183 Session progress" is received.
Does anybody know if there is a way to make transfer_ringback not to be 
triggered by 183? I need it because in the case when the destination 
number is busy and provider sends me 183 and then 486 (Busy here) the 
caller hears one ringback tone and then the busy tone which makes an 
impression that the called party rejected the call.

Thanks,
Irina

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Distinti saluti
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Irina Ivanova
Settore Sviluppo MasterVoice

tel: +39 0522 1590100
fax: +39 0522 331673
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e-mail: i.ivanova at mastervoice.it
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