T42G massive latency before call

[Jeremie]

Hi,

We have more than 20 T42G and we face big latency issues when we make phone calls outside and inside. We enter the phone number, press the send button ..... 0~20s of waiting before connecting and ringing.

2 Zyxel siwtches, GS1920-48 and GS2210-24HP, Xorcom IPBX with Voice VLAN.

Phones configured with VLAN, DHCP directly to the IPBX.

Do you know if there's a setting which can produce latency ? The T42G are upgraded to the last firmware, no additional settings.

Really sorrry for my bad english, I need some practicing.

Thanks in advance for you help.