Agent waiting for call

    <recv request="INVITE" rrs="true">
    </recv>

    <send>
        <![CDATA[
            SIP/2.0 100 Trying
            [last_Via:]
            [last_From:]
            [last_To:];tag=[pid]SIPpTag01[call_number]
            [last_Call-ID:]
            [last_CSeq:]
            Contact: <sip:[service]@[local_ip]:[local_port]>
            Content-Length: 0
            [routes]
        ]]>
    </send>

    <send>
        <![CDATA[

            SIP/2.0 180 Ringing
            [last_Via:]
            [last_From:]
            [last_To:];tag=[pid]SIPpTag01[call_number]
            [last_Call-ID:]
            [last_CSeq:]
            Allow: INVITE,ACK,OPTIONS,BYE,CANCEL,SUBSCRIBE,NOTIFY,REFER,MESSAGE,INFO,PING
            Content-Length: 0
            [routes]
        ]]>
    </send>

    <send retrans="500">
        <![CDATA[

            SIP/2.0 200 OK
            [last_Via:]
            [last_From:]
            [last_To:];tag=[pid]SIPpTag01[call_number]
            [last_Call-ID:]
            [last_CSeq:]
            Contact: <sip:[service]@[local_ip]:[local_port]>
            Content-Type: application/sdp
            Content-Length: [len]
            [routes]

            v=0
            o=user1 53655765 2353687637 IN IP[local_ip_type] [local_ip]
            s=client
            c=IN IP[media_ip_type] [media_ip]
            t=0 0
            m=audio [media_port] RTP/AVP 8 101
            a=rtpmap:8 PCMA/8000
            a=rtpmap:101 telephone-event/8000
            a=fmtp:101 0-15
            a=ptime:20
            a=sendrecv
        ]]>
    </send>

    <recv request="ACK"></recv>

    <recv request="BYE">
    </recv>

    <send>
        <![CDATA[

            SIP/2.0 200 OK
            [last_Via:]
            [last_From:]
            [last_To:]
            [last_Call-ID:]
            [last_CSeq:]
            Contact: <sip:[service]@[local_ip]>
            Content-Type: application/sdp
            Content-Length: [len]
        ]]>
    </send>

    <!-- Keep the call open for a while in case the 200 is lost to be     -->
    <!-- able to retransmit it if we receive the BYE again.               -->
    <pause milliseconds="4000"/>