Grandstream GXP-2000  Call quality is excellent, with a decent
list of codecs: G711 (listed as PCMU and PCMA) G729, G723 and
GSM. The phone lets you choose which order it tries to use
codecs, that list being eight entries long. Strangely, this
phone only actually has five codecs suggesting that Grandstream
intends on including more at a later date. The phone has seven
speed-dial buttons that can be programmed via the web interface.
You get to assign not just a number, but the personâ€™s name,
and the account to use when dialling that person. The first four
speed dial buttons are likely to be set up to be voicemail
retrieval buttons on most phones, although there's a button
specifically for dialling voicemail labelled â€œMSGâ€. A large
LED light to the right of the screen flashes when you have
voicemail, although these work best when connected to a single
central PBX like the one we used during testing. Things can get
confusing if you have four voicemail accounts, all with
different ITSPâ€™s, which makes it e