Question: For the Call Log, how many entries are allowed for dialed, missed, etc.?
Answer:

GXP21xx supports 2000 entries call log in total.
GXP1450 supports 500 entries call log in total.
GXP140x supports 200 entries call log in total.
For GXP20xx, the call log stores up to 50 entries in each call log (Answered Calls|Dialed Calls|Missed Calls|Transferred Call)