title: SipML5 and Asterisk returning 488 in makeCall
body: <p>Trying to make a videoaudio call with SipML5 and Asterisk13, one user in Chorme and the other Firefox, but right after "Ringing"(180) the caller receives "Not acceptable here"(488).
  Asterisk messages: </p>
  
  <p><code>[Jan 23 11:38:27] NOTICE[11127][C-00000004] chan_sip.c: Received AVP profile in audio answer but AVPF is enabled, disabling: audio 36436 RTP/AVP 111 8 0 101
  [Jan 23 11:38:27] WARNING[11127][C-00000004] chan_sip.c: We are requesting SRTP for audio, but they responded without it!
  </code></p>
  
  <p>So about the 488 I found in several pages:</p>
  
  <blockquote>
    <p>488 Not Acceptable Here - 
    The response has the same meaning as 606 (Not Acceptable), but only applies to the specific resource addressed by the Request-URI and the request may succeed elsewhere.
    A message body containing a description of media capabilities MAY be present in the response, which is formatted according to the Accept header field in the INVITE (or application/sdp if not present), the same as a message body in a 200 (OK) response to an OPTIONS request.</p>
  </blockquote>
  
  <p>and</p>
  
  <blockquote>
    <p>You have not enabled AVPF support in the peer, user, or friend entry using "avpf=yes" or have not allowed a codec that is supported by the caller.</p>
  </blockquote>
  
  <p>but I did't found anywhere a way to fix this. Yep, noob in SIP.
  The best i tried was to change my peer in sip.conf (add the avpf=true), but not even the asterisk messages changed.</p>
  
  <p>Is it a codec problem? If so, how do I change for one that works in this case?
  If not, whats going on here? Kinda loosing my mind already. ^^"</p>