- OPTIONS sip:${RAND_ALPHA=8}@${DADDR} SIP/2.0
- Via: SIP/2.0/UDP ${SADDR}:${SPORT};branch=${RAND_ALPHA=6}.${RAND_DIGIT=10};rport;alias
- From: sip:${RAND_ALPHA=8}@${SADDR}:${SPORT};tag=${RAND_DIGIT=8}
- To: sip:${RAND_ALPHA=8}@${DADDR}
- Call-ID: ${RAND_DIGIT=10}@${SADDR}
- CSeq: 1 OPTIONS
- Contact: sip:${RAND_ALPHA=8}@${SADDR}:${SPORT}
- Content-Length: 0
- Max-Forwards: 20
- User-Agent: ${RAND_ALPHA=8}
- Accept: text/plain
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