SIP – no audio behind nat problem

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Hello,

We have 2 grandstream GX 2000 phones behind NAT and Asterisk outside this
natted network.

We have the issue with calls to these SIP phones – no audio.

It is probably the problem with port forwarding on router – but I am not
sure how can I forward same sip ports (5004 to 5100) to two phones (nat
addresses?)?

Any help appreciated!

Z. Zivanovic