Checked X-Lite and could not find a field for the the RTP/RTCP entries.
The default is usually 5004/5005.
Probably the easiest thing to try is to use 5006 and 5008 in your ATA for the RTP entries to minimize the likelihood of conflicts.
You may also want to forward the corresponding port range (5006-5009 UDP) to the ATA'a IP address if you get one way or no audio.
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