System using a strange RTP Port

General Help
1

My phone system was working fine a few weeks ago until suddenly on outgoing calls the remote party could not hear me. I talked to my VOIP provider and they said that it could be because my box was using a strange port (49558) rather then one within the 10,000 to 20,000 range. I checked all my settings but I am still not sure why that port is being used. I put my box in the DMZ and the calls work.

Any idea why its using this non-standard port?

2

Do you have RTP ports defined in SIP Settings?

3

I have checked rtp.conf and it has 10000 and 20000 as start and end settings.

4

Are you sure that the port you are looking at is not the source port as opposed to the destination port?