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ASA Phone Proxy ONE WAY Voice Issue

Hello All,

I have a Call Manager and a Voice Gateway behind my ASA at home. My Voice Gateway Terminates a SIP trunk. I have a 7921 Wireless phone I took to work with me. I added the Wireless Phone to the Company's wireless network. The phone registers with the Call Manager VIA Phone Proxy but when I call my cell phone from the wireless phone I get one way Voice from the Wireless phone to the cell phone. I can not hear Voice from the Cell Phone to the Wireless phone. What could I be overlooking? Is there a special route I need to add to send the Voice from my network back to the Wireless Phone using the Proxy Phone setup VIA the ASA? It is a good chance the voice stream is getting to my network from the Cell phone and over the SIP Trunk but my network does not know how to send it back to the ASA and then to the Proxied Wireless phone at my workplace.