SOLVED! Thank you for your responses. The solution was more obvious though... I had not enabled the call waiting field in the Elastix WEB UI for each extension... Now CW works smoothly!
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Hell there, I have been configuring a production IP PBX (elastix 2.2.0, asterisk 1.8) and the main stations will be SPA504G's ( 7.5.2b ) and SPA303's ( 7.5.2b ). On both models when in active call, the second incoming call is as if it doesn't exist, and the second caller gets a busy signal. For testing I use a third Siemens IP phone in which CW works ok: there is a notifying sound and the display shows the 2nd incoming caller ID. For that reason I have excluded the Elastix Server possible fault. Both SPA devices have Call Waiting enabled, and I just can't seem to understand why is this happening. Do I have to register EXT2 with the same account to get CW work? Or something else?
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