ISDN Q-Interface Signaling Protocol Q.931 Tunneling over the IP Network

Reduce the Cost of Private Telephony Networks
By Cisco Systems

Published 2008; Posted December 2008


Enterprises embrace new technologies to become more efficient and productive. Adoption of advanced technologies can offer the critical operating advantage necessary for the continued success of enterprises in an increasingly competitive business environment. Ideally, enterprises can deploy a technology and operate it cost effectively for an extended period of time; however, this is not usually the case. Technology continues to evolve, which forces enterprises to change the way they operate and work.


Private branch exchanges (PBXs) are crucial communication components in any organization. As an organization grows and expands to multiple locations, it needs to establish multiple PBXs to keep the locations connected. The primary challenge in operating these multiple PBXs is to get them to work as a single entity so that the user experience is consistent and reliable irrespective of location. For example, when a single voicemail system is installed at headquarters, it needs to be accessible to all remote employees as if they are accessing it locally. To achieve such operation, the PBXs must be connected.


As discussed here, the Cisco Q-Interface Signaling (QSIG) tunneling-over-IP feature, which provides the capability to tunnel QSIG protocol messages over an IP network, is an excellent example of a new technology that it is redefining the telecommunications system for enterprises that want to significantly reduce their telecommunications costs without losing existing features. Moreover, it introduces many other opportunities, such as migration to IP-telephony, convergence of voice & data network together, having rich media communication, deployment of unified communication systems etc.


Download paper

Approx. 192 kB


For help with .pdf file downloads, please check out the help topic at


Return to Cisco Gold Sponsor Briefing


Return to Voice over Packet Webtorials menu


Please note: By downloading this information, you acknowledge that the sponsor(s) of this information may contact you, providing that they give you the option of opting out of further communications from them concerning this information.  Also, by your downloading this information, you agree that the information is for your personal use only and that this information may not be retransmitted to others or reposted on another web site.  Please encourage colleagues to download their own copy after registering at