Cisco SPA525G

Contributed in #3089 by David Martin

This is the minimum config for Cisco SPA525G that allows me to send and receive SIP2SIP calls from behind a residential NAT.

Go to Voice / Ext 1 (or whatever extension it is) / advanced:

  • NAT mapping enable: No
  • Proxy:
  • Outbound proxy:
  • Use outbound proxy: yes (otherwise, won't register)
  • User id: just your username (don't include
  • Use auth id: no
  • Use DNS SRV: yes
  • DNS SRV auto prefix: yes
  • Register: yes (if you want to receive calls)
  • Make call without reg: yes (if you want)