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
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
In 1998, the Internet Engineering Task Force (IETF) published the specification for a Session Description Protocol or SDP as a format that describes parameters for streaming media. The original IETF Proposed Standard was updated in 2006 as RFC 4566. Although the SDP was created as a feature of Session Announcement Protocol (SAP), it can be used with Real-time Transport Protocol, Real-time Streaming Protocol (RTSP), and Session Initiation Protocol, as well as a standalone protocol. Parameter negotiation, session announcement and session invitation are included in the descriptive sessions from the SDP protocol. Rather than transmit data like other types of protocols, an SDP negotiates between media type endpoints, format and properties involved. A session begins when a connection is established, and the session is terminated only after every endpoint is no longer participating.
Kernel Network LLC
Kernel Network was founded in 2001. Today Kernel Network is a universal operator providing SIP-telephony services in the corporate and consumer markets. The group of companies Kernel Network provides since 2002 the services of international telecommunicat
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