Configurations
of GSM/VoIP networks allow the service providers to avoid the local Wired
Public Switched Network (PSTN) in communication with a GMS mobile handset. As a
result, the high rates charged by telephone companies are avoided.
we are a professional manufacturer of IP phone and camera.we are a real factory so we can provide good quality product with good price.Do you have any interest in our products?pls kindly logo our web www.great-elec.com.