[sr-dev] [kamailio] Registrar: kamailio update contact infomation failed but it sends 200-register message to client (#497)

Hi,

When client send register message that reg-id in contact is "0", kamailio failed to update contacts info， but it will send 200-register to client, this will cause one issue that no one can find this client(will always be 404 error)

reg-id in message: Contact: sip:2015@100080:5060;ob;reg-id=0 Related logs: /usr/local/sbin/kamailio[30325]: ERROR: registrar [savec:402]: pack_ci(): invalid reg-id value /usr/local/sbin/kamailio[30325]: ERROR: registrar [savec:685]: update_contacts(): failed to pack contact specific info

I think registrar should reply 4xx message when reg-id's value is 0

Best Regards, Shengy

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