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Created by Ryan Harris, last modified on 2018.02.07


integer This is the maximum time we will wait before we get media (whether it's early media, ringing or answer) e.g. maximum PDD before abandoning the route -- the time from Sending the INVITE to receiving the first ringing response for example: a SIP/2.0 180 Ringing or 183. Typical fixed lines have a PDD of under 3 seconds, and mobiles of under 8 seconds.

I set my progress_timeout to 13 seconds to accommodate for slow-setup mobile connections, however, it can probably be shorter. -- Avi Marcus

Two scenarios:

  1. If a carrier is having issues with their platform, all calls might timeout.
  2. If it's not a carrier issue -- if a single carrier timed out at 13 seconds and the user actually waited, the call rarely connected via any other carrier (although they all expired at 13 seconds).

See also: Early Media


<action application="set" data="progress_timeout=20"/>