Resilient SIP trunking
Hi Garry,With the setup I deployed last year I don't believe I saw a round robin behaviour. However, with my config the second SIP trunk was via a seperate SE server (backup pool) which is the...
View ArticleResilient SIP trunking
Hi Jed,I too had this question regarding outbound gateway selection behaviour in Lync - will Lync use the first GW specified in a route definition until/unless that GW is unavailable, or will calls be...
View ArticleResilient SIP trunking
So, now we know DNS is cached. Look this article: http://support.microsoft.com/kb/318803 how to disable the client side caching. Not sure if this is good idea, thou. One thing bothers me - you are...
View ArticleResilient SIP trunking
I tried this with two A records for SBC1 pointing to two IPs and no luck. I had to bounce the services to get any DNS changes to kick in but it didn't ever try to connect to the second SBC IP address....
View ArticleResilient SIP trunking
Jed,You could try the following – instead of A record for each gateway, create single record for SBC1 with the IP addresses of SBC1 and SBC2. On theory, DNS will reply in Round Robin manner and so,...
View ArticleResilient SIP trunking
OK, so you think the Associated Gateway list is a failover pair so that the top of the list is the primary, and in the event of an OPTIONs failure the second gateway is tried ...and so on down the...
View ArticleResilient SIP trunking
Very, very interesting topic!Lync sends OPTIONS sip request every minute or so. If the gateway/sip trunk does not reply in timely manner, the destination is marked “internally” as Down. Now, even thou...
View ArticleResilient SIP trunking
Great one Drago, all sorted now :)I notice this is in the EV planning doc now too:"To solve multiple Mediation Servers interacting with the same gateway peer entity, you need to configure multiple...
View ArticleResilient SIP trunking
"...but it seems Lync topology builder won't let me do this..."This is - if you use IP address as gateway name. Create two DNS A records - SBC1.yourdomain and SBC2.yourdomain pointing to the gateway's...
View ArticleResilient SIP trunking
I'm in the process of testing SIP trunking with Global Crossing, and all is going well, Interop test just completed. However, in this site I need to setup a resilient service so which involves two SE...
View Article