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VoIP IP Phone links:

Aastra SIP compliant IP phones are very popular due to their outstanding quality and value.  These phones have quickly found a solid following from the Asterisk IP-PBX group and you may find these endpoints being used by several PBX manufacturers.  From the high end 57i-CT phone, which comes with a paired cordless handset, to the 53i, each desk-set phone offers functionality and a robust feature set.

Aastra 6753i Brochure          Aastra 6753i User guide         Aastra 6755i Brochure

Aastra 6755i User guide        Aastra 6757i Brochure           Aastra 6757i User guide

Aastra 57i-CT User guide            Aastra 536-560M

Aastra IP SIP Phones:

IP Phones, which ones are most widely used?

General comparisons between the top three IP phone manufacturers.  The big three SIP IP phone manufacturers are Polycom, making the SoundPoint IP phones, Aastra, with their 675x series SIP phones, and Grandstream, producing their GXP series SIP phones.  Each manufacturer offers a line-up of VoIP phones, starting at a basic cost-savings model to their higher end larger feature set phone.  In some cases, the biggest difference can be the LED display size, which can be quite easily seen in the 675x series phones from Aastra.  Polycom has been around from the early stages of VoIP and captured many early followers' with their Soundpoint 501 phones.  These phones are now somewhat showing their age, but many of them are being used everyday and are still sought out, especially in the hosted VoIP market where many hosted providers services are tied to Polycom endpoints. 

General notes and comparison points.

Polycom Soundpoints, being somewhat hard to configure, are known for their great sound quality (acoustics) even in their basic models, with even a higher quality sound noticeable in their HD models. 

Aastra IP phones have a following with the Asterisk and IP-PBX gurus as they can be more easily configured and tailored to behave in certain ways with presence and other endpoint features (scripts).

Grandstream GXP phones are great value, durable and have one model, the 2010 that has been designed for users migrating form a key phone system.

For comparison pricing (a general scale) for the three are Polycom highest, Aastra second, and Grandstream the most affordable.

All three IP phone companies make high quality desk-sets and offer good general support.  Aastra may be a bit stronger in this area, but only by a bit.