错误报文如下：

  SIP/2.0 488 Not acceptable here
  Via: SIP/2.0/UDP 
  192.168.100.3:5060;branch=z9hG4bK3c832484e202e1e6c7d6cfd4e60f8;received=192.168.100.3;rport=20000
  From: "WinSIP 1" <sip:6008@192.168.100.1:64888>;tag=97b7-ea09-7660-ac89
  To: "Device 1" <sip:6002@192.168.100.1:64888>;tag=as5ec49f7d
  Call-ID: 62bf-48359109-0001-Call1
  CSeq: 2 INVITE
  Server: itibia-PBX
  Allow: INVITE, ACK, CANCEL, OPTIONS, PRACK, UPDATE, BYE, REFER, SUBSCRIBE, NOTIFY
 Supported: replaces, timer, 100rel, in-band-dtmf, early-session
 Reason: Q.850;cause=58
 Content-Length: 0

错误原因：语音编解码不匹配