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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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Joined: Nov 2004
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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 LLCHosted Phone Systems Solutions Provider Allworx, Sangoma, FreePBX Telephone & computer systems in the Jefferson City, Columbia MO area.
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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?
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Joined: Dec 2005
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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?
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Joined: Nov 2004
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The SIP protocol is not port specific. The port is negotiated for each call.
ElectSys Tech LLCHosted Phone Systems Solutions Provider Allworx, Sangoma, FreePBX Telephone & computer systems in the Jefferson City, Columbia MO area.
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Joined: Jun 2004
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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.
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Joined: May 2005
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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
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Joined: Jun 2004
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Moderator-Comdial, ESI, Voicemail, Cisco
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Moderator-Comdial, ESI, Voicemail, Cisco
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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.
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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 LLCHosted Phone Systems Solutions Provider Allworx, Sangoma, FreePBX Telephone & computer systems in the Jefferson City, Columbia MO area.
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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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