Some telephones, depending on the brand and model, have the intercom function, which allows to begin communication by sending the signal. When the signal comes, the telephone set rings a signal different from the standard ring tone call. After that the telephone temporarily switches off from the telephone line and works as an intercom.
Hi
I am shumon from Dhaka , my dalier is SHINETELL which one is btcl route if u r interested pls knock me price is good enough and attaractive.
Thanks
hamid
shinetell