[Users] non default port setting

[unplug]

I have 2 questions about the port using in openser with NAT enabled.

Q1. Can I using another port number instead of 5060?

I have tried to change the setting in configuration file.  Below is a
part of configuration file with NAT enabled.

...
port=6060
...
        if (method=="INVITE" && client_nat_test("3")) {
                # INSERT YOUR IP ADDRESS HERE
                record_route_preset("203.193.26.234:6060;nat=yes");
        } else if (method!="REGISTER") {
                record_route();
        };

Sip phone (UA1) can register in openser successfully.  But in the
location table, I have the contact and received field still using port
5060.
sip:871966806561 at 10.0.0.46:5060 | sip:210.184.23.31:5060
As a result, UA1 failed to make a call as the port is not the one we want.

Q2. How can I set multiple port for an openser if another port can be
used instead of 5060?
Say I want openser listen to 3 ports, ie 5060, 6060, 7060.