asterisk users - Jul 2010 - Audio Delay of 1-2 seconds, one way with Zoiper soft phones

Hi All

I will do a test call from a soft phone to my mobile. I can speak into my
headset and the audio is heard instantly. But if I speak into my mobile
there is a 1-2 second delay in the Audio. I am using SIP.

I am only finding it in the Zoiper Softphones that we are using. All other
phones don't seem to have it present. Sadly the customer is Quite attached
to the Zoiper.

I have set QOS = CS5 for both SIP and RTP packets. Altering these settings
has no effect.

We have three 24 port Gigabit switches, with the top switch connecting in
the Asterisk Box. Even the stations plugged into the TOP switch have this
delay and to the same extent as the other switches. No routers on the loop

I have tried switching the stations to IAX. No effect. I have tried using
GSM instead of G711 (alaw). No effect. I have about 30 stations. No change
under heavy or light load.

Is Zoiper any good? Anyone else had these problems?

Colin M
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