1. If the device does not answer within the configured (or default) period (in ms) Asterisk considers the device off-line for future calls. This status can be checked by the SIPPEER function, and inversely this function will only provide status information for peers which have qualify=yes.
      This feature may also be used to keep a UDP session open to a device that is located behind a network address translator (NAT).


      1. Thanks for the clarification , I am just curious how can I use this to keep UDP sessopn open . Actually I am facing some issues with the devices because of bad network .

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