Look at the 3Com V3000. Comes with 4 FXO ports, 1 FXS fax port, AA, voicemail, up to 150 users or more, offsite notification, ACD, Administration through a browser. I think I saw it on the web for $1,600. With a few phones will probably cost you a little over $2,000.
You are probably getting dialtone because the far-end hangs up. Dial tone is used as a tone disconnect. They probably don't hear anything and hang-up the call.
Do a trace on both ends and look at the sample counts in the RTP packets. Verify that every packet you sent is received and vice...
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