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newbie: hardening encryption

cisco router 2651XM running a sip trunk (call manager express)

IOS: c2600-adventerprisek9-mz.124-15.T9.bin

after having my sip account hacked I want to harden the encryption in my router. 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 I'm going to set up a logging trap as well.

How can I harden the encryption in my router?: - specifically the sip-ua section which currently looks like this in my config:

sip-ua

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

sip-server dns:mysipprovider.co.uk

Thanks for any advice.

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