It could be ipkall or something else. More tests would help find the problem. If you call me at my SIP address (in that PM I sent you) I have Wireshark running and can check your SDP packet for possible errors.
In order to test your ipkall number you can temporarily forward it to a known working SIP address such as 411@proxy01.sipphone.com, then call your ipkall number and see if there is two way audio.
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