[sr-dev] [kamailio/kamailio] rtpengine : add node fallback if node out of port (#2621)

[dvillaume]

When rtpengine answers with error-reason 'Ran out of ports' adopt the same behavor that when node answers 'Parallel session limit reached'

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#### Description
Backport of the 'sessions limit' behavor for the 'Ran out of ports' error-reason.


You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2621

-- Commit Summary --

  * rtpengine : add node fallback if node out of port

-- File Changes --

    M src/modules/rtpengine/rtpengine.c (10)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2621.patch
https://github.com/kamailio/kamailio/pull/2621.diff

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