title: Cannot make calls from Skype for business mobile clients to Cisco
body: <p>I have a Skype for Business system currently deployed in my work area. Before that, we were using all the Cisco Clients and other telephony clients.</p>
  
  <p>I am seeing a strange behavior, that is I am able to make calls from my Skype for Business mobile clients to my Cisco phones, but when I do reverse I cannot get the call established.</p>
  
  <p>What is see is SIP status code 488 (in wire shark trace) - which is codec mismatch.</p>
  
  <p>I see that an invite message from Cisco phone offers media via 0 and 101 codecs.
  But still not able to get the call through.</p>