What kind of extension is this?

[denflompy]

When I list all my extensions the output below comes out regarding extension 3599
What kind of extension is this as I want to display it to have a look at the programming.
Any help would be gretly appreciated.
Output follows:

list extension-type 3599

EXTENSION TYPE

Ext Type Name
3599 QSIG TSC endpoint

 

[orypecos]

QSIG has to do with trunks

Da-vi'do Juan-is'imo
P.S. For the best response to a question, read FAQ222-2244. Also give the type & version of your voice mail & pbx & preview your post to make sure it is complete & understandable. Please answer all questions so that I may have the info to assist you. Leaving a post on how you fixed the problem will also be appreciated.

 

[Dunstan]

TSC is a Temporary Signaling Channel used in conjunction with QSig pipes (Usually a tie to adjunct switch or device).