Halo, my name dadang setiawan

sample case

 VOIP Server  A
IP Address : 192.168.10.57
voip number Jon 100


Voip server B
IP Address : 192.168.15.30
voip number Brian  200

i am using linphone video for comunication jon & brian
the question is

How to solution comunication jon with brian
withhout  200@192.168.15.30

but direct 200 without using @