[Asterisk-Users] Cisco to Cisco - poor quality

[Bob Knight]

I have never used Cisco phones, but I have had problems in the past
relating to * RTP talking to a widget with VAD turned on.
* RTP stack can not run on its own.  It relies on receiving RTP packets
for doing its timing.

A simple test is to sniff the line to make sure the phones always send 
packets.
If you see pauses, you may need to disable some type of VAD setting on 
the phone.
Or just never quit talking when using the Cisco phone.

Terence Parker wrote:

>I have set canreinvite=no in the sip.conf for each user (well, there are
>only two) using a cisco phone. What does this imply?
>
>As for whether the problem is due to the phones or asterisk however,
>indications would suggest both, because:
>
>- Voicemail works fine (and is clear)
>- I can initiate a call between MSN and Cisco, and that would sound fine.
>
>This might suggest a problem with my phones. However :
>
>    -  When using Vocal previously, Cisco to Cisco conversation was fine.
>
>This has led me to be completely stumped! I notice some mention elsewhere
>about asterisk lacking certain codecs because of license restrictions? Is
>this anything to do with me? Or should the phones still - in theory - be
>able to talk to each other without any problems? I have tried the cisco
>phone on both g729a and g711ulaw.
>
>I'm currently *trying* to get ahold of an updated firmware for my phone. I
>will see if this fixes the problems.
>
>Thanks again,
>
>Terence
>
>------
>
>  
>
>>How are the phones "talking" to each other?  Directly, or through
>>asterisk?  (canreinvite=<what?> in the sip.conf for each of them?).
>>
>>What I'm trying to get at here is, it is a problem between the phones,
>>or are you having a problem possibly with the asterisk box?  Some other
>>things to know: are you running voicemail yet?  If so and you can dial
>>into it from either of the phones, how does it sound?  If not, how about
>>anything from the * box....like the demo annoucment stuff?
>>
>>Daryl
>>    
>>
>
>-----
>
>  
>
>>>Thanks for the replies.
>>>
>>>My cisco firmware is only POS3-04-2-00, though it is SIP. It
>>>used to work fine under vocal though - which was strange. Is
>>>this definitely nothing to do with asterisk? I do note
>>>however that my firmware is fairly old... except cisco aren't
>>>exactly generous with firmware upgrades.
>>>
>>>I have tried both g729a (default on my phone) and g711ulaw
>>>with no success. But i'll have another fiddle and try to get
>>>it to work.
>>>      
>>>
>
>
>
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>  
>


-- 
Bob Knight
[-w] the work option
bk at minusw.com
925-449-9163