SIP over TCP support only (no traditional SIP over UDP allowed).The 9951 brought these additional challenges: Other peculiar aspects, which the 9951 shares with the previous 79XX series of phones have been left out as there are ample resources available elsewhere. The 9951 introduces a few more curveballs, which I will mention here. What are the Tricky Parts?Ĭisco phones have never been terribly straightforward to configure. If you are looking for tight integration between your endpoints and your Asterisk PBX, you’ll want to consider a phone that supports Asterisk, such as a Polycom, Snom, Grandstream, Aastera, or Linksys device. If you are OK with certain features not working, like the Contacts button or aspects of Voicemail indication/calling, proceed. The Cisco Unified IP Phone 8961, 9951, and 9971 phones were not designed to work with any phone system other than Cisco Unified Communications Manager.
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