INBOUND FROM TEXTPOWER SERVER
TextPower POSTS to the following IP addresses on ports 80 (Standard) and 443 (Secure) so firewalls must be open to inbound traffic for them:
64.37.202.6
209.67.98.180
OUTBOUND TO TEXTPOWER SERVER
Customers access TextPower URLs that have the following IP addresses (firewalls must be open to outbound traffic on these addresses):
64.37.202.247 (http://www.textpower.com/services/)
64.37.202.249 (https://secure.textpower.com/)