One-way audio when calling multiple SIP

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Hi,

On one of our locations, I am having issues with one-way audio when I call
several phones with SIP/Phone_A&SIP/Phone_B&SIP/Phone_C. When I call the
phones individually, they work fine, so it’s not a volume setting on the
phone. Also this setup has worked at other locations.

Any idea’s what to look for?

Thanks in advance.