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.
SIPRoutes.com
At SIPRoutes.com we have pioneered a new way to source SIP Termination providers. By creating a marketplace with every major vendor available, our customers choose the vendors that meet their quality and pricing requirements.
Read moreTop countries:
United States 1294
India 440
United Kingdom 425
Canada 348
Bangladesh 338
China 142
Pakistan 134
Australia 133
Spain 123
Russia 114View all countries