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T48G Span to PC function not working
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KenDoerksen Offline
Junior Member

Posts: 5
Joined: Dec 2015
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Post: #1
T48G Span to PC function not working
I am trying to troubleshoot a SIP issue on a T48G phone. I know the phone memory buffer does not allow for long pcaps on the phone. I have setup the phone to span to the PC port so I can use Wireshark for my pcap. However, wireshark does not see any traffic passing through it.

I used the instructions listed here:http://support.yealink.com/faq/faqInfo?id=314 under situation 2.

I also just upgraded the firmware on the phone to as we do not want to use screen savers yet on the phones.

Any other ideas how to get the traffic to pass through the PC port so I can get a good pcap using wireshark?

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04-04-2017 03:44 PM
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Lucia_Yealink Offline
Super Moderator

Posts: 467
Joined: Aug 2016
Reputation: 5
Post: #2
RE: T48G Span to PC function not working
Hi Sir,

To use Span to PC feature, please connect the Internet port of the IP phone to the Internet and the PC port of the IP phone to a PC. Before capturing the signal traffic, make sure the data packets can be received from the
Internet port to the PC port.

Please check if you use: http://support.yealink.com/faq/faqInfo?id=314 under situation 1, can you get the pace?
Also, can you update the firmware to the latest version and test again:

Also, you can try to receiving data packets from the HUB:
Connect the Internet port of the IP phone and the PC to the same HUB, and then use Sniffer, Ethereal or Wireshark software to capture the signal traffic.
04-06-2017 11:29 AM
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CWR Offline

Posts: 716
Joined: May 2013
Reputation: 7
Post: #3
RE: T48G Span to PC function not working
Also can do Port Mirroring if you have smart switches.
Phone on Port 1
PC on Port 2
Mirror the 2 ports so all data travels thru both ports...

Craig Reilly
MCSA, 3cx Advanced Certified
Scottsdale, AZ
04-06-2017 03:58 PM
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