Client calling the server and sending dtmf

    <send retrans="500">
        <![CDATA[
            INVITE sip:[service]@[remote_ip] SIP/2.0
            Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]
            From: "client" <sip:client@[local_ip]>;tag=[pid]SIPpTag00[call_number]
            To: <sip:[service]@[remote_ip]>
            Call-ID: [call_id]
            CSeq: [cseq] INVITE
            Allow: SUBSCRIBE, NOTIFY, PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, MESSAGE, REFER
            Contact: <sip:client@[local_ip]:[local_port]>
            Max-Forwards: 70
            Content-Type: application/sdp
            Content-Length: [len]

            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 response="100" optional="true" >
    </recv>

    <recv response="180" optional="true" >
    </recv>

    <recv response="183" optional="true" >
    </recv>

    <recv response="200" rrs="true">
    </recv>

    <send>
        <![CDATA[
            ACK [next_url] SIP/2.0
            Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]
            From: "client" <sip:client@[local_ip]>;tag=[pid]SIPpTag00[call_number]
            To: <sip:[service]@[remote_ip]>[peer_tag_param]
            Call-ID: [call_id]
            CSeq: [cseq] ACK
            Max-Forwards: 70
            Content-Length: 0
        ]]>
    </send>

    <pause milliseconds="3000" />

    <nop>
        <action>
            <exec play_pcap_audio="dtmf_2.pcap"/>
        </action>
    </nop>

    <pause milliseconds="15000"/>


    <send retrans="500" rrs="true">
        <![CDATA[
            BYE [next_url] SIP/2.0
            Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]
            From: client <sip:client@[local_ip]:[local_port]>;tag=[pid]SIPpTag00[call_number]
            To: sut <sip:[service]@[remote_ip]:[remote_port]>[peer_tag_param]
            Call-ID: [call_id]
            CSeq: 2 BYE
            Contact: sip:client@[local_ip]:[local_port]
            Max-Forwards: 70
            Subject: Performance Test
            Content-Length: 0
        ]]>
    </send>

    <recv response="200" crlf="true">
    </recv>