SIP softphone register with CME without username/password

Hi, all,

I set up a SIP-SIP gateway on a C2821, this C2821 routes all outbound calls from CUCM to an ITSP (both over SIP trunk), C2821 itself does not act a CME, i.e, there are no SCCP or SIP clients registered to it, in fact I do not have any configuration that would allow a SCCP/SIP phone to register/authenticate, however, I found that a software SIP phone that has IP connectivity to this C2821 can register to it and therefore make outbound phone calls. I am puzzled, did I miss anything obvious?

Thanks, Jian

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