This message also posted in security/network management:
cisco router 2651XM running a sip trunk (call manager express)
after having my sip account hacked I need to make my sip trunk secure. I'm fairly certain my sip details were hacked using packet sniffing but not 100% sure. My sip provider has changed my password but I'm reluctant to re-register with my sip provider because my new details will just get sniffed again. In the meantime I have changed all the router passwords to strong ones and set up a logging trap as well with delays to discourage brute force attacks.
How can I harden the encryption in my router or make my sip trunk resilient to packet sniffing? My sip-ua currently looks like this:
authentication username xxxxxxxx password 7 152552393279781D06
calling-info pstn-to-sip from number set xxxxxxxx
retry invite 2
registrar dns:mysipprovider.co.uk expires 3600
Thanks for any advice.