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SIP Gateway -

We had our SIP trunk connected to our CUCM 8.5 hacked into last month for two days before the phone carrier issues blocks to stop the calls.  When I look in CDR it shows only the calls as coming from an unknown but in a rapid fire format.  I did some research to help determine how this occured.  I checked unity to ensure that the restriction tables are setup correctly which they are.  This piece I do not understand is our voice network is not on the Internet.  What are the ways our voice network can get hacked if not thru the internet and not internally?

2 REPLIES
Hall of Fame Super Gold

SIP Gateway -

Most likely is from the internet, even if it is not clear to you how. Other possibily is that somehow you can get dialtone calling from PSTN.

Bronze

Re: SIP Gateway -

Hi,

    In additon to paolo, may due to following reasons,

1.  you didn't use the trustlist of the sip provider ip address in your gateway

2.  your firewall may have a general rule to allow outside sip traffic to internal gateway, give a specific access rule to allow the sip traffic from the provider to your gateway.

Please rate if this helps.

Thanks

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