Whoch Software & Technologies Ltd China

we are selling a cheap and low rate interntional card, users can achieve phone to pc function and free calls ,welcome to contact us.

we are the voip supplier and we are devote to offer better service to every user.
There is a very good chance that you have been using VoIP for some time now. That’s because Telecoms figured out a while ago that VoIP can help streamline the routing of 1000′s of phone calls. But more and more lately, voice over IP is making headway in businesses and homes as a great alternative to regular phone services. VoIP is often termed an ‘international calling service‘ but the fact is it is often used to make local calls

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General office

Whoch Software & Technologies Ltd
Nishan road Nanshan district
Shenzhen
Guangdong ,518000
China

Phone: +86 755 - 8620 4320
Site: http://www.wholeswitch.com/

Contact Person

jack ao / Sales Manager
Phone: +15900177055

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Session Initiation Protocol (SIP) is a text-based standard put in place by the Internet Engineering Task Force (IETF) and is the primary protocol for Voice over Internet Protocol services. SIP is similar to a MGCP in that it's a signaling protocol that can create, maintain and terminate sessions in IP-based networks. These sessions include multimedia conferencing and two-way phone calls. SIP protocol can run on User Datagram Protocol (UDP), Stream Control Transmission Protocol (SCTP) and Transmission Control Protocol (TCP) because it was created to function independently from the underlying Transport Layer as an Application Layer.

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