PBX Extenders United Kingdom
Citel is The VoIP Migration Company™. We develop the world''s most comprehensive portfolio of network-edge products enabling enterprises to realize the cost and productivity benefits of IP telephony.
With Citel''s Portico™ TVA™, existing PBX handsets connect directly to a Session Initiation Protocol (SIP) based on-premise IP PBX or Hosted IP telephony service provider. Citel can help you determine which type of deployment strategy - Hosted or premise-based - is best for you and the needs of your enterprise.
Loughborough Innovation Center Epinal Way Loughborough
Loughborough ,LE113EH
United Kingdom
Phone: +44 (0)1509 808550
Site: http://www.citel.com
- Cloud-based Unified Communications Service Provider
- Hardware
- Hosted PBX Service Provider
- Hosted VoIP billing service provider
- International VoIP Wholesale Provider
- Internet Telephony Service Provider
- Internet VoIP and Video Conferencing Service Provider
- Marketing Services
- Mobile VoIP
- Network Service Provider
- Voip Termination ISP
- Wholesale VoIP Carrier
- Call Back
- Call Relay VoIP Solutions
- Call Routing VoIP Solutions
- H.323 Softswitch & CPE
- H.323 VoIP Gateway
- H.323 Wireless/ GSM VoIP Solutions
- Hosted PBX
- Hosted VoIP
- IP devices
- Polycom
- SIP Softswitch & CPE
- SIP VoIP Gateway
- VoipSwitch
- 2N
- 3CX Phone System
- Asterisk
- Blue Lava Prorietary 2 & 4 Port Analog VoIP Gateways
- SIP softphones
- 2N
- IP PBX
- IP Phone
- ProfitBilling
- Voip Switch
- voipnow
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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