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REGISTER sip:ims.airtel.in;transport=udp SIP/2.0
Via: SIP/2.0/UDP 10.100.104.138:5090;rport;branch=z9hG4bKHHFe953FDeX3m
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From: <sip:XXX@ims.airtel.in>;tag=K7jKp2Q7QF27H
To: <sip:XXX@ims.airtel.in>
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Contact: <sip:XXX@10.100.XXX.XXX:5090;transport=udp;gw=airtel-profile>
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