Connection parameters for SIP "trunking" provider

[thufir]

Referencing p 176 of the definitive Asterisk guide, 4th ed, I’m trying to configure for babytel like so:

article.gmane.org/gmane.comp.tel … ser/58888/

how do I specify:

SIP Proxy: sip.babytel.ca
SIP Proxy port: 5060
Outbound Proxy:3 nat5.babytel.ca
Outbound Proxy port: 5065

in sip.conf?

As per their directions:

User ID can be any one of your 11-digit babyTEL telephone numbers. Typically your main number but can be any one of your other phone numbers.
For your protection the SIP Password field does not reveal your password until you explicitly click on ‘Show password’.
If Outbound Proxy is not supported on your system, try one of the following two options:
    Add the line “198.38.7.34 sip.babytel.ca” to your system’s “hosts” file and configure the SIP Proxy as: “sip.babytel.ca:5065”. This uses the TCP/IP “hosts” file address mapping mechanism to redirect SIP traffic to the Outbound Proxy.
    Configure the SIP Proxy as: “198.38.7.34:5065”. This replaces the SIP Proxy address with a resolved Outbound Proxy address.

I modified the /etc/hosts file. Not sure it was necessary, but I did as suggested above.