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#35987 02/02/07 08:38 AM
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We have a Comdial MP5000 phone system, and we have a branch office using the EP300 SIP phones over a VPN.

Ocasionally we get some scratchiness on the line, and I was told to turn on QoS in our Cisco 2811 routers on both sides. Which protocal should I use within QoS?

I see rtp audio, h323, rtcp, rtsp, and a few others. i was told that h323 wont work.

Thank you.

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#35988 02/05/07 07:44 PM
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Your router needs to be either SIP aware or capable of picking up the precedence tag. I don't have my notes in front of me but if I remember correctly, the packets leaving the EP300 phones already have a precedence tag.


ElectSys Tech LLC
Hosted Phone Systems Solutions Provider
Allworx, Sangoma, FreePBX
Telephone & computer systems in the Jefferson City, Columbia MO area.
#35989 02/06/07 07:35 AM
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Thank aweaver.

I talked to my IT consulting company, and they said that I need to find out what the DSCP marking is, which i believe is the precedence tag you mentioned.

I figured out that rtp audio, h323/rtcp don't work. In my router rtp audios DSCP marking is just default, but h323/rtcp's DSCP marking is cs3. If you know what the DSCP marking is then i can add it.

Do you by chance know what that might be?

#35990 02/07/07 07:14 AM
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Update:

I found the DSCP for the EP300 SIP phones, and it is DSCP 40(cs5), but know I need to find out what port the phones use.

Anybody know what port they use?

#35991 02/22/07 07:38 PM
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The SIP protocol is not port specific. The port is negotiated for each call.


ElectSys Tech LLC
Hosted Phone Systems Solutions Provider
Allworx, Sangoma, FreePBX
Telephone & computer systems in the Jefferson City, Columbia MO area.
#35992 02/23/07 09:11 AM
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Moderator-Comdial, ESI, Voicemail, Cisco
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That is why a VPN or SIP-aware router is required, because port forwarding can't be really used to establish the connection.

#35993 02/24/07 05:40 AM
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Does that mean if I have a sip aware router I do not need a vpn?


Jim Hoey

SST Communications
597 West Montauk Highway
Lindenhurst, New York 11757

631 956-0100

www.sstcom.com

Business telephone systems on Long Island and New York City like Comdial, Vertical, Avaya, Panasonic
#35994 02/24/07 09:12 AM
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Unfortunately I don't know the first-hand answer to that, since I've only done it with a VPN. Hopefully someone else who has used a SIP-aware router can answer that.

#35995 02/26/07 07:46 PM
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ComdialJim
As far as I know, the answer is "No." Sip aware allows for identification of SIP packets for QOS. It cannot allow for a peer to peer connection between two private IPs on disparate networks.


ElectSys Tech LLC
Hosted Phone Systems Solutions Provider
Allworx, Sangoma, FreePBX
Telephone & computer systems in the Jefferson City, Columbia MO area.
#35996 02/27/07 03:57 PM
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thanks guys


Jim Hoey

SST Communications
597 West Montauk Highway
Lindenhurst, New York 11757

631 956-0100

www.sstcom.com

Business telephone systems on Long Island and New York City like Comdial, Vertical, Avaya, Panasonic

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