

We provide downloadable documents such as user manuals, product datasheet, product brochures, product leaflets, etc.


Together with our agents and distributors, we provide convenient local service and quality after-sales maintenance service. The standard service provided is 5×8 (5 days a week, 8 hours a day) technical service support, providing customers with maintenance, repair and remote technical support services through phone and e-mail.

The FAQ section summarizes the solutions to some problems in the installation, configuration and use of New Rock hardware and software products.



We provide the latest trends of ICT, follow us on the industry news and master the latest cutting-edge technology!



(New Rock Technologies, Inc.) is a new generation of intelligent communication equipment and solution provider. We provide future-oriented intelligent communication products and services to customers such as telecom operators, governments, enterprises, etc.

Since the establishment 19 years ago, New Rock has always taken R&D as our core mission and insisted on independent innovation. New Rock has more than 80 certificates and honors, with 19 years of industry brand recognition and influence, and is the common choice of many customers!

New Rock has established a nationwide service system with Shanghai headquarters as the center and six branches or offices in Beijing, Guangzhou, Shenzhen, Shandong, Wuhan and Chengdu to provide customers with perfect pre-sales consultation and after-sales service.

Please leave your message for any needs, we will do our best to serve you!

Welcome to become New Rock partner! Hand in hand together to build a bright future!
News
VoIP often fails behind NAT because SIP controls the call but RTP carries the audio—and NAT hides the private IP the endpoints think they should use. STUN, TURN, and ICE are the tools that fix this.
Definition: NAT traversal is the set of techniques that let VoIP signaling and media cross a Network Address Translation boundary so internal phones can call external ones.
| Tool | Role | When used |
|---|---|---|
| STUN | Discover public IP:port | Most home/office NATs |
| TURN | Relay media when direct fails | Symmetric NAT / strict firewalls |
| ICE | Negotiate best path (STUN then TURN) | Endpoint candidates |
SIP messages embed the private IP in the SDP. Without correction, the far end tries to send RTP to an unreachable address. STUN reveals the public mapping; an SBC or ALG rewrites the SDP so media flows.
A Newrock SBC terminates NAT and normalizes SIP/RTP for both on-prem and remote users, removing the need to juggle ALG settings per site.
For typical NAT yes; for symmetric/strict NAT you need TURN relay or an SBC.
It performs the NAT handling centrally, so endpoints behind it don't each need their own traversal config.
Classic NAT/SDP mismatch—fix with SBC or correct NAT settings.
SIP often UDP or TCP; RTP is UDP. Keep both allowed through the firewall.
NAT is the #1 cause of VoIP one-way-audio and registration failures. An SBC (or correct STUN/TURN/ICE) solves it cleanly and centrally.
Tel:021-61202700 / 52217917
Address:5/F Block B, Building 1, No.188 Pingfu Road, Xuhui District, Shanghai 200231, China
Copyright © New Rock Technologies, Inc. All Rights Reserved. 沪ICP备15008515号-1

