Eric Jiang
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Activity overview
Latest activity by Eric Jiang-
Eric Jiang created an article,
The Technology to Help the Voice Quality in VoIP
In practical, customer may have different network environment, we will introduce some technologies here that may help you overcome the voice quality issue. QoS Tos and Cos are just the mark mechani...
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Eric Jiang created an article,
SIP Codecs and Voice Media Introduction
This article will introduce some basic knowledge about how voice is captured and transmitted in the VoIP environment. How can we convert analog voice signal to digital voice signal? The steps are: ...
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Eric Jiang created an article,
Brief Introduction of WebRTC
What is WebRTC WebRTC is an open source project and we can use it for real-time communication of audio and video. It can be used in browsers like Firefox, Chrome and Opera. It is a components runni...
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Eric Jiang created an article,
Common Causes for Linkus Voice issue
Environment PBX firmware version: 30.10.0.17 Android client version: 2.0.19 iOS client version: 2.0.19 1. Linkus Server or Client version is too low Make sure use the latest version on both serve...
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Eric Jiang created an article,
How to Get Linkus Debug Logs
Environment PBX firmware version: 30.10.0.17 Windows client version: 1.1.12 Android client version: 2.0.19 iOS client version: 2.0.19 Mac client version: 1.0.9 Log capture tips: usually you nee...
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Eric Jiang created an article,
Common Causes for Linkus Registration Failures
Environment PBX version: 30.8.0.17 Linkus server version: 2.0.15 Here are some common causes for the Linkus registration issue. 1. Linkus Server or Client version is too low Make sure use the lat...
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Eric Jiang created an article,
Common Causes for SIP Outbound Call Failures
Environment PBX version: higher than 30.8.0.14 Trunk Type: SIP trunk 1. Caused by diversion header Set Diversion to None in the setting: Trunk > Advanced > Outbound Parameters, Diversion 2. Inco...
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Eric Jiang created an article,
Check List for SIP Call Issues
Checklist for voice issue Confirm the problem is no audio or one-way audio if is one-way audio which side can’t hear the audio. Confirmed that NAT settings on PBX are correct, like external IP add...
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Eric Jiang created an article,
Understand the different scenarios of SIP call
scenarios PBX in local network location 1. IP Phone in local PBX and IP Phones locate in same local network Both PBX and IP Phones use local IP Address in sip contact header Both PBX and IP P...
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Eric Jiang created an article,
Brief Introduction of SIP and SDP Protocol
SIP call flow SIP protocol is defined in RFC3261 and use INVITE sip message to initial a call. Here are some introduction about SIP messages: INVITE Caller party use to initial a call 180 Ring Ca...