Hi, Im using latest Elastix stable, and 8 grandstream SIP Phones (with POE). Im experiencing robotic speech sometimes when phones are ringin and sometimes in place calls. I know this happen due to packet lost. It is a new network, using airlink (2 of them) poe switch/hub, no router, only static ips. Cables are cat5e, no sipura, we are using a certified asterisk card(dont have the specs with me, but if they are required, ill post them). We are using GSM codec right now, we decide to use it since the problem started, but it still happens. PBX hardware specs - recommended gigabyte Motherboard, 2GB Ram ddr2, 80GB HD Sata, Celeron Processor 3.06Ghz, socket 775. We are also experiencing some busy lines, calls dont hang up properly sometimes. Any suggestions? Any info request? Thank you for spending time reading this.