I put a note out to Cisco about this in their support forums: https://supportforums.cisco.com/message/3610263
So far the only response has been that this is "unusual". :( Thanks, Jarrod On Thu, Mar 29, 2012 at 10:01 AM, Jarrod Cuzens <[email protected]> wrote: > Greetings all! > > We recently purchased 21 Linksys SPA 962 phones for our office. We are > running these directly from our PoE switch (Cisco 300) to our sipx box > which is on the same subnet and switch (sipx is not running iptables). Most > of our phone calls work correctly but we are finding that periodically (say > 1 in 10 phone calls) we have no audio. > > The most interesting part of the problem is that it appears to be the > phone itself although I cannot find anywhere online where anyone describes > having the same issues with this phone which is what makes me wonder if > it's part of my setup. The reason I believe that it is the phone is because > of the attached pcap trace. You can see the first call in this trace is bad > and the second one is actually completed correctly. > > The negotiation over SIP all seems to work correctly and the phone says > what RTP port to use but when sipx tries to communicate to that RTP port > the phone returns an ICMP port unreachable! From attaching a syslog to the > phone as a debug server it appears that the phone believes it has opened up > the receiving port but further down it attempts to send rtp back to sipxecs > and it cannot send rtp back but this is because I believe the port failed > to allocate/open in the first place. > > I have tried all four of the available Cisco firmwares that I could find > and they all produce the same issue. I'm hoping that someone here can > identify if I'm going nuts or not and maybe recommend something out of the > box. > > TIA >
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