Hi Spuluka,
You're correct. I configured source NAT (pool) at first. It's till not working. Then I configure source NAT (1:1 mapping) with destination NAT instead of an old way. Problem is gone!
But mow, TFTP is done but IPphone still can't make a call. I think. Root cause is NAT. Could you suggest me what type of NAT is recommended for IP Phone? Source NAT or Static NAT?
