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Openstack Neutron - preserve SIP source port

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currently I'm running freeswitch servers on Openstack Ussuri with Neutron linuxbridge. The problem is that the SIP source port got changed from 5080 to random port when sending INVITE to the carriers. If the call is getting long enough, the random port created by PAT will be closed. Therefore, if any SIP message from the carrier sent to that port will not be translated to the original source port (5080) => SIP message cannot be received by freeswitch

Is there any way to preserve the source port for SIP messages?

SIP message flow

mangohost

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