[Asterisk-Users] IAX2 Softphone Quality & Network Cards

[Paul Mahler]

I have had uniformly bad experiences with soft phones when there are network
issues. Hardware phones seem to work much better if there are network problems.
For example, I have been able to make fine calls over a wireless link I use
with a cisco 7960, but NO softphone works over the same link. 

You should also look at the settings for the NIC on the computer. Are your
network equipment and NIC both set for full or half duplex? They should be set
to the same duplex setting. GIG equipment is easier, it defaults to full
duplex. 

Hope this helps!

Paul



On 8/26/05, Adam Robins <arobins at pharmacentra.com> wrote:
> We are in the process of an Asterisk call center deployment using IAX2
> G711 ulaw softphones.   Outbound sound quality is terrible.
> 
> This week we rebuilt the entire LAN with Cisco 2950-EI switches and 
> have employed QoS on the switches and router.  Still sounds terrible.
> 
> What we are now finding is that the network card in the PC may be the 
> key to the problem.  A Dell Optiplex P4 2.4GHz 512MB machine with an 
> onboard Intel NIC is bad, while an older Dell Dimension P3 864MHz 
> 128MB machine with onboard 3COM sounds good.
> 
> Has anyone out there had a similar experience?
> 
> Thanks,
> Adam

Paul Mahler
www.signate.com