Eric Jiang
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Activity overview
Latest activity by Eric Jiang-
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...
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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...
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Eric Jiang created an article,
NAT
NAT NAT is Network Address Translation. This is router or firewall translate one IP to another. Usually, is translate private address to public address. Dynamic NAT Dynamic NAT use a group of publ...
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Eric Jiang created an article,
SIP Call Issue Troubleshooting Guide Content
SIP Theory NAT Brief Introduction of SIP and SDP Protocol Troubleshooting Understand the different scenarios of SIP call Understanding Voice Transmission of Remote Extension Check List for SIP Ca...
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Eric Jiang created an article,
How to Analyze SIP Calls in Wireshark
When we face a problem like a call failed or no audio in SIP, usually we need to get the PCAP dump file and check the packets. This article is about how to use Wireshark to analyze SIP calls. 1. ...