Conflicting Port Number UDP

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Level 1

17 points

Conflicting Port Number UDP

Hello. I hope I can get someone to help or give some answer here. I've tried getting help from VOIPo.com, my phone service provider, but they were not able to figure this out. I am trying to configure my Airport Extreme so that I can get better quality calls. Here's part of their instruction on VOIPo:

1. Assign static IP to VOIPo adapter
2. Enable port forwarding and forward port range 5004-65000 (UDP) to the new static IP.

I tried to set up port mapping with that range but it resulted in an error message indicating Conflicting Port Number UDP. I don't have anything else set up, and VOIPo can't offer have any answer. Any idea? Thanks!

Jason

iMac 2.8 HGz Intel Core 2 Duo, Mac OS X (10.6.7)

Posted on Apr 13, 2011 4:03 PM

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Answer 1

Tesserax

Level 10

158,274 points

Apr 13, 2011 6:14 PM in response to Jason C

Please take a look at the following Apple Support article to see what may be using any of the UDP above 5000 to get an idea where to look to find the conflicting application.

One of them is Multicast DNS (used by Bonjour and AirTunes); another is RTP (used by iChat & iChat AV).

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Answer 2

Jason C Author

Level 1

17 points

Apr 14, 2011 10:41 AM in response to Tesserax

Thank you for the response Tesserax. I shared this with VOIPo. Although they replied that I could set up rules to avoid these ports, but they wouldn't guarantee that calls would have no problems.

I wonder if you or someone can give an opinion if it's excessive to require a port range of 5004-65000 (UDP) just for a VOIP?

Jason

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Answer 3

Tesserax

Level 10

158,274 points

Apr 14, 2011 2:03 PM in response to Jason C

I wonder if you or someone can give an opinion if it's excessive to require a port range of 5004-65000 (UDP) just for a VOIP?

Not necessarily ... and it really depends on which protocol is being used for VoIP communications.

For example:

Using H.323 (Callserve), utilizes the following ports:
o UDP port 1719 (Callserve signalling)
o TCP port 1720 (Callserve signalling)
o UDP ports 5000 to 65535 (RTP audio stream)

Using SIP:
o UDP port 5060 (SIP signalling)
o TCP port 5060 (SIP signalling)
o UDP ports 16384 to 32767 (RTP audio stream)

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