I have installed AutoAttendant in Call Manager 3.3 release. I have two regions one is default and the other is remote. I am using G 711 Codec for Default as well as remote region. But for the inter-region calls i am using G 729. When i call the Auto Attendant number from Default region i am able to get the welcome greeting from the Auto Attendant.
But when i am dialing from the remote region i am getting a busy signal.
Auto Attendant is based on IP-IVR which only supports G.711 calls. If you are using G.729 then you need a transcoder to convert the call to G.711 first before AA.
A bit poor on Cisco as they've shipped this for over 2 years now and not fixed it (it really should work as G.729) especially as Unity supports g.729 out the box now. I guess it's because it's only a freebie and they'd like you to buy more hardware to get it to do everything you want.
As mentioned in a previous post, you can transcode with hardware - which is definitely the preferred method and you will want to do this at the head-end... that is take G729 to G711. However, as an interim, you can use the software resources on Callmanager.
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