Notify and codec line

I have two problems, the first one is why is Asterisk sending out notify messagens? There has not been any Subscribe or any other message sent, just the register. According to RFC 3265 section 3.2,

?Designers of such mechanisms are also warned to make a distinction between sending a NOTIFY message to a subscriber who is aware of the subscription, and sending a NOTIFY message to an unsuspecting node. The latter behavior is invalid, and MUST receive a “481 Subscription does not exist” response?.

The other problem is that my client adds a /1 to the portnumbers used in rtp and Asterisk is regeting that line. But the line is following the standard.

The line looks likte this: m=audio 17742/1 RTP/AVP 0 3 8 101

anybody go a clue?