Need clarification on ports used in SIP (Cisco Phone)

Asterisk Asterisk Support
1

Ok, I’m little confused with what ports is what

I’m trying to understand whats needed. In my Asterisk host I opened firewalld for 5060 (SIP protocol) and range 15000-15100 for RTP. From what I understand, each active channels will use 2 ports from RTP pool. I don’t expect more than 50, so I narrowed it down to this range. Same ports forwarded through the company router to outside world.

Now, I was setting up Cisco phone following those instructions and got little confused on what I’m doing and why. Phone installed at home, behind another router. (everything works, I just want to understand)

First confusion:
Phone have it specified that SIP port 5060.
Why do I need so specify on proxy: mydomain.com:5060 ?
Also, there is a recommendation to start with number and go up for each consecutive port. Next phone will be 5061 and so on. How are those all ports relate to each other?

Also, I had RingCentral phone before and they wanted ports “triggered”, not “forwarded”. Is there some simple instructions or article on how this works and what all of those terms mean?

2

Using 5061 etc., is a tactic for dealing with NAT. It is not specific to SIP.

The proxy things sounds like a Cisco thing. Simple Asterisk configurations don’t have explicit proxies.

3

Cisco SPA or 7900 series?

You probably don’t. Phone should default to 5060.

4

Asterisk SPA504G

sysadminman.net/blog/2011/using- … eepbx-2714

It just stopped working again. I was cleaning up sip.conf, changed all passwords to complex ones. Now (of course I changed password in Cisco setup) - it won’t register… Didn’t spend much time yet to figure it out…

Is there any restrictions on what passwords can be used? I used pwd generator and they all 8 charchters with upper/lower case letters and numbers