Lync answer with SIP 491 - Proxy Side Reinvite Failed, pass result to GW when we try to make a RE-INVITE.

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• יום רביעי 24 אוגוסט 2011 07:44

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  Hi,

  Please check you set type=friend and canreinvite=yes on gatetway trunk.

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• יום רביעי 24 אוגוסט 2011 07:50

   

   
  

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  Hello Sean,

  Thank you for the answer, when you say settings "type=friend" and "canreinvite=yes" on gateway trunk you are telling in the Lync Side configurartion using powershell command or in the device i'm using to connect to the PSTN?

   

  At Lync Powershell commands we have the Set-CsPstnGateway with the option "Routable"

   

  http://technet.microsoft.com/en-us/library/gg398408.aspx

   

  Should we activate this to true? Does this influence the external call transfers made by this PSTN Gateway? 

  
  
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• יום חמישי 25 אוגוסט 2011 01:50

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  Do you deploy other servers(cucm,Asterisk) for IP Phone?

  Some gateway and IP -Pbx server support the canreinvite setting.

  I did not find any configuration can set canreinvite in lync server.

   

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• יום חמישי 25 אוגוסט 2011 07:25

   

   
  

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  The gateway does already a reinvite, that the Lync answers with 491 ( don't know the reason why he doesn't accept the reinvite message ), but if we repeat this reinvite message then he accept.

   

  • סומן כתשובה על-ידי nhcoohrh יום שלישי 30 אוגוסט 2011 14:24
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• יום חמישי 16 פברואר 2012 19:21

   

   
  

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  We see the same behavior to a re-invite.  Do you see in the 491 something that refers to "supported 100 rel" in the message response?   We see Lync and OCS both respond in this fashion.  Prior to the 491 we see an invalid 100 trying generated out of the mediation server which is outside of accepted responses to this request.  An additional re-invite is being sent with identical information and we see Lync and OCS then generate a 2XX response.  We do not have an answer on this either, good to see we are not alone.
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• יום שישי 17 פברואר 2012 09:14

   

   
  

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  Usually this happens only on re-invite, and when the re-invite contains something that the Lync doesn't like/accept.

  example, you do a hold, and make re-invite to provide moh source to Lync client, and then you provide moh source without encryption. If you have media-bypass ON the Lync endpoints by default only work with encryption. So you could face some error message like 491 from Lync.

  I don't know what is your example, but i believe when Lync gives 491 to re-invite (to all attempts of reinvite you do) it's because something wrong in the new offer.

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