Abstract
Introduction/purpose: To specify the practical application of ECMA355 and ECMA-336 Standards for Q-SIG tunneling and the implementation of mapping functions via the existing IP (Internet Protocol) network of the Serbian Armed Forces (Intranet SAF), in the Private Automatic Telephone Network SAF (PATN SAF), as the main part of the Private telecommunication-information networks of integrated services SAF (PISN SAF). Methods: Description of the implemented solution and analysis of the software parameters of the established transmission SIP route, with the display of the results obtained in the fight with jitter and echo in the network. Results: With such a solution, it was achieved that participants from the peripheral parts of the PISN SAF, which operate on the principle of transmission and circuit switching by TDM (Time Division Multiplexing), can connect with each other via the newly established central IP network SAF (Core network) which operates on the principle of transmission and switching packets with the SIP (Session Initiation Protocol), without losing the functionality of QSIG from the framework of the digital telecommunication network of integrated services ISDN (Integrated Services Digital Network). Conclusion: The article deals with the modern IP PINX (Private Integrated Services Network Exchange) manufactured by Mitel, type MX-ONE Service Node 6.0, which is implemented at the transit level PATN SAF and which successfully implements the process of tunneling Q-SIG through the IP network and the necessary functions for mapping the transmission of tunneled QSIG messages and mapping voice (and other audio) information to VoIP (Voice over IP) communication media streams through that network. Also, the basic elements for its software preparation during the introduction of a new SIP route, with a capacity of 30 IP trunks in a transmission beam realized with 100 Mb/s-T Ethernet, are given, and the fight with the present jitter and echo in the network is described. Finally, the paper presents the experience-based values of the parameters for reducing the influence of jitter and suppressing echo.
Highlights
The Serbian Armed Forces (SAF) is a specific organization that has its own, modern, functional telecommunications information system (FTIS), for sufficiently fast and quality processing and transmission of accurate and protected information
The tunneling of Q-signaling through IP proxy using the SIP is practically realized on one part of the PATN SAF, where the interconnection between two participating transit IP PINX type Mitel MXONE Service Node 6.0, is realized by a transmission beam of 30 IP trunks, and via a connection path organized with a capacity of 10/100 Mb/s Ethernet
The experience gained shows that the following practical procedures are recommended for suppressing disturbing echo network VoIP traffic in the PATN SAF: 1. The EC must be switched on enabling the Echo suppression function
Summary
In the PATN SAF, the applied tunneling procedure for the transmission of encapsulated messages from Q-SIG, defined by the global ECMA-355 Standard, enabled calling between PINX, i.e. "islands" within PISN parts with circuit-switched circuits that use Q-signaling, they are interconnected, in one part, by the transport IP network (which uses the SIP). Without any loss of Q-SIG functionality, the connection of participants with the specified end PINX is realized, by transiting through the IP PINX type Mitel MX-ONE Service Node 6.0, which are interconnected by Core network. The applied solution for tunneling Q-signaling via the transit IP PINX, through the organization of the SIP transmission beam through its own IP network (Intranet SAF) on the Core part of the Automatic Telephone Network SAF, represents a novelty in the organization and operation of the PTN SAF In this way, the service life of the Q-SIG type network signaling system, proven in practice, has been extended in the PATN SAF. In addition to the above, in the PATN SAF, the new solution with the use of the IP network to connect the IP PINX using the Q-SIG tunneling procedures opens a whole range of other modern possibilities that will, with the undoubted growth of the Core network, contribute to the creation of a wide territorial platform and the implementation of multi-timed communications in real time, leading to the transition to UC (Unifed Communications)
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