1.- Cisco Unity Express supports only G.711 voice streams, so all calls made into the system (including those from IP phones, PSTN gateway ports and any other VoIP equipment in your network) must use G.711.
2.- If you require that G.729 calls traverse IP segments of your network between sites, and that these calls forward or dial direct into voice mail, then you must use a transcoding resources to change the voice stream from G.729 to G.711 before the voice stream enters voice mail pilot numbers.
You can see this URL where explains this type of scenarios:
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
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CUCM Database Replication is an area in which Cisco customers and
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