The Studio Microphone (2200-69631-001) is supplied with a 7.6m cable, terminated in RJ11 connectors.
Poly have this FAQ in regards to common questions which suggests the cable should not be extended.
FAQ Attached or FAQ LINK
Polycom is not using normal cable for Expansion Micpod, it’s customized
- Wires 1, 3, 6 for microphones are specially shielded for voice transmission quality
- The outer shield – the invisible 7th wire – is used as GND signal.
If other 6P6C cable is used, it might work if with luck. But typically the voice quality might be impaired (reason 1) or it just doesn’t work(reason 2).
Possible solution:
We were able use double the length by connecting two 2457-69573-001 with a jumper made of two cat 6 shielded connectors and short piece of Cat6 shielded cable. The RJ12 was wide enough to touch the side of the connector to provide continuity for the shield which Poly seems to be using for the power to the microphone. Possibly something like this barrel below would work? (maybe just need to pry the side contacts a bit if it is not so tight.)
Tripp Lite Cat6 Straight-Through Modular Shielded Compact In-Line Coupler (RJ45 F/F), TAA https://www.tripplite.com/support/N234001SH