Hangup() v/s Hangup()

pbx_extension_helper: No application ‘Hungup’ for extension (phones, h, 6)

will the above command make any negative impact

If I remember the behavior of the PBX core correctly it’ll stop your call where it is. You really should just fix it so the message goes away. Hungup is not “Hangup”.

Also oddly enough it looks like he’s in a ‘h’ extension which I don’t believe should ever contain the Hangup command.

You can invoke hangup() command from the h extension, I have used to stop the continuation of the dialplan under certain conditions