I would also add ports 5003, 5090 and 443 to give you remote access...

But I also agree with the CLI sending. Depending on the configuration required by the SIP provider of course, but I usually set the SIP carrier details to send CLI table 2, then in CLI table 2 either set each number for each SIP trunk, or, set the main number for all ports, or direct indial for each extension etc.

If the CLI fields are blank for a particular extension and trunk, then it will send the number recorded in the trunk data section.

With no number set (or the default extension numbers in the CLI table for example) it will usually fail the call attempt as its telling the SIP carrier the wrong user details and will give the opposite hangup message.

Cheers, Dave.
Eco Communications
Selling and installing Ericsson BP150/50/250 from 1996 to 2005
Samsung selling and installing since 2000
Toshiba selling and installing since 2004
Microsoft NT and SQL certified (10 years ago...)