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Topic # 114080 7-Feb-2013 15:46
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Hi All,
Just having some trouble with a Draytek 2130. Just put a phone system in to a site and they had one of these at their main branch. Our system has a feature called SP-NET which is just a linking protocol Samsung use to link multiple PBX's. It doesn't use standard SIP but rather a group of ports for doing the different jobs. Mainly 6000 for signalling/call setup, 6100 for the BLF's and trunk selection and then ports 30000-30031 for the RTP.

Now it seems the that call is being set up. I see that progress no problem. But the issue is there is no RTP getting back in to the system on the main end.

I have put an 'allow all' rule in to the access control list just to see if it makes a difference but it doesn't seem like it. Is there somewhere else I can get the the firewall rules? Maybe on the CLI?

Any help much appreciated.

Sam

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571 posts

Ultimate Geek
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  Reply # 757007 7-Feb-2013 16:21
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Assuming they are running NAT, are you opening up the ports using the NAT functions or the Firewall section?



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  Reply # 757014 7-Feb-2013 16:31
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Yea so I have 6000, 6100 and 30000-30031 forwarded to the system.

The thing that I don't get is that the normal SIP trunks are working fine and work on the same RTP ports and speech through them is fine.

 
 
 
 


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  Reply # 757015 7-Feb-2013 16:37
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A couple of things worth checking:

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  Reply # 757016 7-Feb-2013 16:39
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chevrolux: on the same RTP ports.


Wait, can I just clarify that you're not trying to forward the same ports to 2 end points?



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  Reply # 757047 7-Feb-2013 18:08
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Yup. Using UDP for the RTP ports. And no it is all forwarded to the same host.

Have turned off SIP ALG and Hardware NAT. Like I have said, the normal SIP trunks work fine so I don't get why it only blocks the RTP traffic when going through sp-net. Maybe I need to do another trace and just double check.

Edit: will check on firmware tomorrow. Not sure about that.

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  Reply # 757136 7-Feb-2013 21:48
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If some RTP traffic is making it through and to that host, then nothing can be blocking it, the 2130 isn't L7 aware - I'd be checking to make sure it's definitely trying to use the correct ports.



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  Reply # 757201 8-Feb-2013 08:16
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Yea you make a good point..

Just checked the firmware and am on 1.5.3.

Will do another trace today with wireshark and just double check the call is getting set up.

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  Reply # 758840 9-Feb-2013 23:56
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No worries. Give me a yell if you're still running into trouble. Feel free to email me your Wireshark/PCAP files if you'd like another pair of eyes over them.

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