SIP debug messages of only one line

I’m seeing what seems to be rather strange output when “sip show debug ip” is set for a particular remote phone. It only consists of one single line…

<— SIP read from :5063 —>

Naturally the ip address is the same as the one I set up for the debug…

Is this normal/expected? From what I’ve seen before, there’s usually a lot more information.

I’m wondering if the end point (Grandscream phone) is failing or pitching some sort of fit…

Thanks in advance,
Ah