[asterisk-users] SIP-NAT failure on dynamic IP

[Technical Support]

We have a client running Asterisk using a dynamic IP.  When the IP lease is
renewed to a different address, their SIP connections to external clients
fail (one way audio).  
 
A simple asterisk restart fixes the problem, but they can't count on an
admin always available.  Is there way in sip.conf or other to eliminate the
dependence on a particular IP?  (for clients behind NAT)?
 
Thanks,
MD
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