[cisco-voip] Jitter buffering on NEC phones

[Joseph Mays]

My apologies in advance for sending this to the Cisco VOIP list, since it's not, strictly speaking, a cisco issue, but I'm hoping to find someone here who has worked with NEC DT700 voip phones, because we are trying to get an answer to what should be a simple question, but no amount of calling to NEC has yielded an answer, and multiple searches online have proven useless.

We are trying to figure out how to set the jitter buffer in NEC DT700 phones to 160ms. Or set the buffer for 16 10ms packets. We have a template config we found on NEC's site that contains all the parameters that can be set for the phone, but no amount of begging NEC support through several layers of escalation has yielded a simple answer to what exactly are the config parameters we want. The section they are in is easy enough to identify; it should be one or two of the following parameters --

phone.audio.rfc2833.dtmf.relay="0" phone.audio.onhook.dtmf.mode="1" phone.audio.pcmu.pref="4" phone.audio.pcma.pref="5" phone.audio.g722.pref="3" phone.audio.g729.pref="6" phone.audio.g7221.24kbps.pref="1" phone.audio.g7221.32kbps.pref="2" phone.audio.g729.vad="1" phone.audio.pcmu.ptime="80" phone.audio.pcma.ptime="80" phone.audio.g722.ptime="80" phone.audio.g729.ptime="80" phone.audio.g7221.24kbps.ptime="80" phone.audio.g7221.32kbps.ptime="80" 

The codec we are using is G711, so it's probably among the default values, rather than the values aimed specifically at g722 or others.

Again, my apologies for sending it here, I have been very hesitant to do so for days, but we are out of other options, and at this point are just hoping that there is either someone who knows DT700 phones or knows VoIP in general enough that they can identify what we need to set for 160 ms (16 10ms packets) jitter buffer.

Joe Mays
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