DComTalk.com

I have used my PAP2-NA with one VOIP provider for several months without any
issues. I want to configure another provider for line 2. Should the SIP
port be set the same on each line. Right now, line one is assigned to port
5060. It looks like the unit came shipped with port 5061 as the default for
line two. Should I leave it, change it, or does is matter?

It will need to be on a different port to Line 1, 5061 is fine.

That made sense, so I left line one on 5060 and line 2 on 5061. I plugged a
phone into each jack. When I called the number associated with line 2 from
line one it didn't ring. The call went directly to voicemail. When I
assigned both lines to port 5060 it worked fine. I don't know why or if it
was just a fluke and there will be trouble later.

yes, just live your line 2 set as 5061. all you need to activate you need to activate your line 2 is have the authentication ID and password of your SIP account.