C4 Telecom, S.L. Spain

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General office

C4 Telecom, S.L.
C/ Francisco Suarez, 9
Madrid
Madrid ,28036
Spain

Phone: +34 91789 7150
Site: http://www.c4telecom.com

Contact Person

Guillermo Monguio / WholeSales Manager
Phone: +34 91 789 7150

Hosted VoIP billing service provider
International VoIP Wholesale Provider
Internet Telephony Service Provider
Internet VoIP and Video Conferencing Service Provider
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E1 Bulk Wholeseller
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Phone To PC
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Cisco Systems
Mera

Billing system of own development

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TerraSip S.A.

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VoIP Favors SIP

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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