Hi - I'm after a FreeSWITCH app which will do the following: 1. Call comes in. 2. Outbound call is originated to the same number via a gateway 3. If we don't get ringback (a SIP 183) from the outbound leg within a timeout, return a 480 to the original inbound caller 4. Having got a 183 from the outbound leg, start tone detection to detect ringtone (425Hz single tone in this case, but it'd be good to be able to detect dual tones as well) 5. If we hear ringtone within a timeout period, then send a 183 to the original caller and bridge the calls together; the calls then proceed as normal 6. If we don't, then return a 480 to the original caller and dump the outbound call. If, at any time, the outbound call is answered, it needs to be immediately bridged to the inbound one. I'm able to offer a reasonably substantial bribe for this - if you'd like to have a go at claiming it, please let me know how large a bribe you'd need, how long it'll take you and don't start until it's agreed..! Cheers -- Dave -- David Knell, Director, 3C Limited T: 020 8114 8901 F: 020 3002 7257 M: 001 415 630 3031 http://www.3c.co.uk