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SIP-B and "CFWD Notify Serv" Usage

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By default, SPA3xx and SPA5xxG IP phones have SIP-B_Enable and CFWD_Notify_Serv set to no.

  • Phone's Web-UI: SIP tab > SIP-B Enable: No
  • Phone's Web-UI: Ext N tab >Call Feature Settings > CFWD Notify Serv: no
  • Phone's config file: <SIP-B_Enable ua="na">No</SIP-B_Enable>
  • Phone's config file: <CFWD_Notify_Serv_1_ ua="na">No</CFWD_Notify_Serv_1_>

The only time you would need SIP-B and "CFWD Notify Serv" set to Yes is if one of the following are true:

  • Phone registers to a SPA9000 IP PBX
  • Phone registers to Sylantro

Do not enable either SIP-B or CFWD Notify Serv if you are using Broadsoft or any other third-party call control aside from a Linksys SPA9000 or Sylantro.

If you do enable the above, you will see SIP SUBSCRIBE "missed-call-summary" messages being sent. These messages are not of use to Broadsoft or any other third-party call control besides the SPA9000 and Sylantro platforms.

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