Suddenly you realized that external SIP phones stop working without any reason, you should be avare of Cisco routers get stuck sometimes. There is a trick to solve the issue with two commands, but first of all be sure that the sip is not registered through arterisk cli: Type on your asterisk: asterisk -rvvvvv and […]
At the beginning of the year 2011, we decided to apply the IPv6 configuration to our data center (VeriTeknik) and requested our IPv6 block from RIPE. RIRs give out /32 blocks to LIRs at the first assignment. This article describes basic Cisco IPv6 configuration. The Preparation Steps Request your IPv6 Addresses from your RIR or […]
If it appears to be all (***) instead of your mail hostname and if you get, “550 Sorry, your HELO/EHLO greeting must resolve (#5.7.1)” error when sending mail to your mail server from outside, run the following command in your CISCO firewall: no fixup protocol smtp 25 and save with the “wr mem” command