Aastra 9133i

The phone has an RJ9 jack for an industry standard headset. No 2.5mm or 3.5mm – just the typically high end RJ9 equipment supported here, which is in keeping with the phone’s medium to large business target market.

The phone supports POE out of the box and a 48V PSU is supplied. Most of the phones run on 5v and have a circuit to convert 48V POE power into 5v, but the Aastra runs on 48v whether you use the supplied power brick or if you use POE to run the phone. It’s probably running 5v internally but runs a 48v PSU for compatibility with Telco power supplies – but replacing a 48v PSU is harder than replacing a 5v PSU.

The trump card for this phone is that it has the best speakerphone on test. However, if you talk over someone then they’ll not be able to hear you properly, so having an argument with the Aastra is hard, but conversations flow naturally with the Aastra’s speakerphone in a way that they don’t the others on test.

This is by no means a bad phone - in fact for the corporate market, this phone is a good alternative to the Polycom. It’s feature packed, it has a proper speakerphone that you can use without wondering if the person you’re talking with can hear you and it’s good value for money. The problem is that you need to upgrade the firmware to get the phone to work properly in a small office environment, and most small offices won’t have the resources to do that.


At £116.33, this is really competing with the likes of the Polycom and offers some superior features. If you desperately need a speakerphone the Aastra is the only one worth considering, but if not it's hardly clear cut.

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