Anybody seen this on pyMSNt?

Hi,

I just noticed today this stanzas:

<presence to='some_jid@xxxxxxx' from='tel:+15559191@xxxxxxxxxxxxxx'  
type='subscribe'><x xmlns='http://jabber.org/protocol/roster- 
subsync'><item subscription='from'/></x></presence>

(jid and phone number changed to protect the innocent).

This tel: jid is invalid AFAIK, but seems to be related to the SMS  
gateway of MSN, right? Or is this something different that I don't  
know about (most likely)?

Thanks,
--
HIId: Pedro Melo
SMTP: melo@xxxxxxxxxx
XMPP: pedro.melo@xxxxxxx