SIPp功能很强大，通过配置流程可以实现大部分的SIP场景。下面是利用SIPp实现的对OpenSIPS进行REGISTER进行压测的xml文件和csv文件。

register.xml

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE scenario SYSTEM "sipp.dtd">

<scenario name="branch_client">
  <send retrans="500">
      <![CDATA[

   REGISTER sip:[remote_ip]:[remote_port] SIP/2.0
   Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]
   From: <sip:[field0]@[remote_ip]:[remote_port]>;tag=[call_number]
   To: <sip:[field0]@[remote_ip]:[remote_port]>
   Call-ID: [call_id]
   CSeq: 1 REGISTER
   Contact: sip:[field0]@[local_ip]:[local_port]
   Max-Forwards: 5
   Expires: 60
   User-Agent: SIPp
   Content-Length: 0

   ]]>
  </send>

  <recv response="401" auth="true">
  </recv>

  <send retrans="500">
   <![CDATA[
    REGISTER sip:[remote_ip]:[remote_port] SIP/2.0
    Via: SIP/2.0/[transport] [local_ip]:[local_port];branch=[branch]
    From: <sip:[field0]@[remote_ip]:[remote_port]>;tag=[call_number]
    To: <sip:[field0]@[remote_ip]:[remote_port]>
    Call-ID: [call_id]
    CSeq: 2 REGISTER
    Contact: sip:[field0]@[local_ip]:[local_port]
    [field1]
    Max-Forwards: 5
    Expires: 60
    User-Agent: SIPp
    Content-Length: 0
  ]]>
  </send>                          
<recv response="200"></recv>

<!-- definition of the response time repartition table (unit is ms) -->
<ResponseTimeRepartition value="10,20,30,40,50,100,150,200"/>
<!-- definition of the call length repartition table (unit is ms) -->
<CallLengthRepartition value="10,500,1000,5000,10000"/>
</scenario>

SEQUENTIAL
6000;[authentication username=6000 password=6000]
6001;[authentication username=6001 password=6001]
6002;[authentication username=6002 password=6002]
6003;[authentication username=6003 password=6003]

以上代码对Asterisk 和 OpenSIPS均适用。