What is VOIP trunks? What is VOIP trunks? acuratsx (TechnicalUser) (OP) 18 Dec 07 02:39 I found some stuff on SIP trunking, what is exactly VOIP trunks and are they much more beneficial if you're running a VOIP pbx or hybrid? RE: What is VOIP trunks? staticroute (MIS) 14 Jan 08 15:11 There are variants to VOIP trunks...SIP being one of them, H.323, etc. A voip trunk is a session between two termination points. I for one specialize in SIP trunks between our softswitch and Call Manager, in this way you don't need to purchase a costly PRI and it's associated equipment for VOIP phone service. RE: What is VOIP trunks? Vonexer (Vendor) 1 May 08 19:49 Voip trunk are voice over ip. Whether it runs on an IP based PBX only or a hybrid does not matter. Your going to have the same quality.A hybrid can have advantages where your infrastructure may not be so stable, digital sets are beneficial. Use IP based phones in inaccesible areas where network is already available. It can be easier to set up and move around.Digital sets are going to be more reliable since they do not ride on your data network. So a failure in your network infrastructure does not also bring down your phone system with it. Ip based voice requires a very good network infrastructure that is planned and upto date including QOS to avoid voice problems.