IP Phone Debug & Syslogs

Snom:

SIP signaling and IP packet traces can be collected from the Status menu:

http://wiki.snom.com/Web_Interface/V8/SIP_Trace

http://wiki.snom.com/Web_Interface/V8/PCAP_Trace

DrayTek:

Capturing VoIP, Debug and trace logs:

http://just.draytek.com/index.php?option=com_k2&view=itemlist&task=category&id=153

FritzBox:

Under Telephony --> Telephone Numbers the Voice Transmission tab contains information about recent VoIP calls.

Traffic captures can be saved using the following link (and opened using Wireshark): http://fritz.box/html/capture.html

Cisco/Linksys:

Configuring Debug and syslog Messages from SPA adaptors:

https://supportforums.cisco.com/document/36921/using-slogsrvexe-utility

Yealink:

Under the Desktop IP Phone menu choose your model and click the article 'How to Get the Correct Syslog':

http://support.yealink.com/faq/faqSearch?p=11

Grandstream:

The Syslog feature is generally under the Advanced Settings page:

http://www.grandstream.com/support/faq/troubleshooting/troubleshooting-questions