I have just installed the VitalPBX from DigitalOcean Marketplace.
PBX extensions are not able to receive the call. Error: 488 not acceptable
Client: Grandstream Wave Server Platform: DigitalOcean Singapore Extension Type: SIP Change Default Port to 15060 instead of 5060 from Setting->Telephone Settings->SIP Setting->Bind IP 0.0.0.0 Port 15060
Extension: A make a call request to Ext B Ext B press the “Accept” Button. Ext A ring status changed to talking and times count started. But Ext B still see ringing.. and few times later error 488 not acceptable