Hi!
I think the problem is not on the matchon Expression, 'cause I tried writing a phone number in the 'City' blank on a contact on my address book and Phone Zimlet is not recognizing that as a phone number.
Given that, I'm guessing that there may be some kind of properties file in which you can tell Zimbra where you want your zimlets to work and where not.
Anyway, here you have my <matchon>, if it helps.
<matchOn>
<regex attrs="ig">\b(sip\
{1}[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b</regex>
</matchOn>
Any help will be appreciated.
Thank you very much