3000 Old Alabama Road Suite 119-434, Alpharetta, GA 30022-8555404-424-8202info@volpefirm.com

What SIP is and Why Cable Operators are Interested

SIP trunking is gaining ground with cable companies looking to build their business today and generate future revenue. SIP is a significant way to leverage IP voice communications and a way to shave costs.

SIP = session initiation protocol, is the IETF protocol for VoIP and other text and multimedia sessions, like instant messaging, video, online games and other services.  SIP is very much like HTTP or SMTP. Messages consist of headers and a message body.  SIP message bodies for phone calls are defined in SDP -the session description protocol.

  • SIP is a text-based protocol that uses UTF-8 encoding.
  • SIP uses port 5060 both for UDP and TCP.  SIP may use other transports.

SIP offers Cable Operators:

  • SIP trunking is a significant way to leverage IP communications to shave costs.
  • Cable companies are using SIP trunking as a simplified way to offer their customers VoIP capability.
  • SIP trunking offers a means of generating revenue from business and residential customers who, in turn, will benefit. from the savings and flexibility of this service.

Since SIP is a flexible protocol, it is possible to add more features and keep downward interoperability.  SIP also does suffer from NAT or firewall restrictions.  SIP can be regarded as the enabler protocol for telephony and voice over IP (VoIP) services. The following features of SIP play a major role in the enablement of IP telephony and VoIP:

  • Name Translation and User Location: Ensuring that the call reaches the called party wherever they are located. Carrying out any mapping of descriptive information to location information. Ensuring that details of the nature of the call (Session) are supported.
  • Feature Negotiation: This allows the group involved in a call (this may be a multi-party call) to agree on the features supported recognizing that not all the parties can support the same level of features. For example video may or may not be supported; as any form of MIME type is supported by SIP, there is plenty of scope for negotiation.
  • Call Participant Management: During a call a user can bring other users onto the call or cancel connections to other users. Also, users could be transferred or placed on hold.
  • Call Feature Changes: A user should be able to change the call characteristics during the course of the call. For example, a call may have been set up as 'voice-only', but in the course of the call, the users may need to enable a video function. A third party joining a call may require different features to be enabled in order to participate in the call
  • Media Negotiation: The inherent SIP mechanisms that enable negotiation of the media used in a call, enable selection of the appropriate codec for establishing a call between the various devices. This way, less advanced devices can participate in the call, provided the appropriate codec is selected.

What We Offer

  • We offer consulting to small and medium cable operators on SIP calling solutions and troubleshooting.  By doing this you will reduce cost and overhead.
  • We will help select the best SIP trunking providers to ensure your "VoIP", VoIP service and quality.
  • From our analysis and depending on your needs we can recommend products your company should purchase.
  • We troubleshoot DOCSIS cable modem configuration files to ensure quality of service for SIP voice calls.
  • We troubleshoot SIP impairments.
  • Let us help you increase revenue via SIP solutions.