Every packet has a "destination port number" and a "source port number". Ordinarily port 5060 is used for SIP packets to/from Voxalot SIP servers. Therefore if you want to use proxy01.eu1.voxalot.com you would set
Proxy: proxy01.eu1.voxalot.com:5060
Outbound Proxy: proxy01.eu1.voxalot.com:5060
Because 5060 is the default SIP port so you can also use
Proxy: proxy01.eu1.voxalot.com
Outbound Proxy: proxy01.eu1.voxalot.com
Also set
Use Outbound Proxy: yes
Use OB Proxy In Dialog: yes
If you are using DNS SRV then you can't specify the port number because will disable the ATA's DNS SRV feature.
Once the Betamax FUP and other issues have been resolved you may want to use DNS SRV for better reliability.
You don't need to forward any SIP ports in your router unless you wish to avoid using a STUN server.
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