My Telco has removed the A record for their VoIP server, and now has only SRV data there - which seems not to work properly.
The SRV data contains various services (SIP via UDP, TCP, secure TCP, whatever), and these get individual expiry counters in the caching resolver. So when a telephone sends a query, the caching resolver will provide that data in the "Additional section" - but only those records that have not yet expired. If the configured service (the one the telephone should use) is no longer contained in the answer (but others are still present), the telephone goes offline until all the records have expired and a new authoritative query is made. The Telco is of no help - they just want to sell their own equipment. The telphones (Alcatel) are the usual linux plastic box, and I cannot easily hack these. It probably does not behave fully correct, but also not fully wrong. In BIND/named I didn't find an easy approach to fix the issue - it doesn't look like it is supposed to be fixed there. And before I go for the more difficult approaches, I would like to ask how this is actually supposed to work, at all. -- PMc -- Visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information. bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
