We are experiencing the exact same issues with the 7935's. We upgraded the phone load to P00503010100. Phone sounds better (more like full duplex), however, microphone pickup is still weak. My sales rep seems to think spider mics are unavailable for the 7935. May have to go analog. Hope this helps.
Spider mics are definitely unavailable for the 7935. They would have to do some sort of network module add-on for it as there aren't even any places to plug mics in unless you have a radically different hardware revision than I have :-/
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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