1. Understand the SIP Theory
Understand the NAT
Brief Introduction of SIP and SDP Protocol
How to Understand Inband Progress Option
Understand the PBX NAT Settings
How Do the PBX NAT Settings Work?
2. Perform the troubleshooting
Understand the different scenarios of SIP call
Understanding Voice Transmission of Remote Extension
Check List for SIP Call Issues
Common Causes for SIP Outbound Call Failures
How to Analyze the 30 Seconds Hangup Problem?
3. Refer the cases
- One-way audio & NAT related issue
The Router Settings Relevant with One Way Audio & 30 Seconds Call Hang up Issue
One-way Audio after Hold Retrieve from Cisco CUCM Extension
One-way Voice Issue when TA1610 Integrated with Cisco Cloud PBX
- Internal Call Failure
Unable to Make Calls by TA FXS Ports - Invalid Caller ID Number Configured
Internal Call Failure - SRTP is not Enabled on the Phone
- Inbound Call Failure
Incoming Call Failure - Caused by Default SIP Port 5060 on PBX Changed
Calls are Rejected by Cisco SPA122 - Caused by Auth INVITE in Cisco SPA122
Unable to Receive Incoming Calls from the SIP trunk - Session Timer Required
- Outbound Call Failure
Intermittent Call Failure when Using TkReg SIP Trunk
Failed to Make Outbound Call - INVITE Packet Size Larger than Router MTU Requirement
Failed to Make Calls from TE/TB to SIP trunk When Caller ID is Blank
Outgoing Call via Peer Trunk Failed - Wrong DOD number
Unable to Make Outbound or Inbound Calls through SIP Trunk - ACL Strategy on Provider Side
SIP Trunk Status Unreachable - SIP Provider Didn't Respond the OPTIONS Packet from PBX
Outbound Call Failure when TA2410 Integrated with Mitel PBX
Failed to Make Outbound Calls - Line is Inactive
- Transfer Call Failure
Call Transfer failed- Caused by the T.38 Option
- Call Drop or Call Hangup issue during active call
Call Dropping after 5 min via SIP trunk - Carrier Response 420 Bad Extension
Call Dropped after One Hour -Timeout Limit on Provider Side
Calls Drop after 12 Seconds - Abnormal SIP Contact from the other SIP Device
Calls Drop after One Minute - Caused by Extension Max Call Duration(s)
4. Log Capture
If issue persists after you perform the above steps. try to get and post us the logs when you replicate the issue for further analysis.
1) System Log with Debug option enabled.
Here is the guide about how to get the System Log:
https://support.yeastar.com/hc/en-us/articles/360007653294-How-to-Get-System-Log
Also tick Debug option,
2) PCAP log
Here is the guide about how to get the PCAP capture:
https://support.yeastar.com/hc/en-us/articles/360007739473-How-to-Get-PCAP-Dump-Capture
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