One of the main benefits of qualify=yes is to detect network problems with peers. We send a lot of calls via a service provider using SIP but we have qualify-yes set so that if it becomes unreachable the dial fails immediatly without having to wait for a timeout which enables us to seamlessly failover to an ISDN connection.
Chris Owen wrote: > We have a tenant who has been having issues with a congested connection and > in trouble shooting it we've noticed that there seems to be a lot of SIP > traffic even when none of the phones are doing anything. > > We've determined that this traffic is mostly INFO packets generated by > setting qualify=2000. I understand that 2000 ms is the default value for > the qualification parameter but what I'm unclear on is exactly what the > purpose of having asterisk qualify the phones is. > > I know that in a NAT situation, qualifications can help keep UDP sessions > open in the firewall but in our case most phones are not behind NAT. > > I realize qualifying phones is also how asterisk keeps track of who is > available for things like BLF but surely it doesn't need to do that every 2 > seconds to keep the BLFs reasonably current. > > So I guess my question is what is the real purpose of the qualify setting in > a non-NAT situation and can one safely set the qualification as something > higher. I'd think something like 15 seconds would be more than enough for > BLFs and the like. > > Chris > > > -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
