Mumble server -
IP: ua.mumble.com
PORT: 9350

Latest Stable Release of XPM: v0.6.7
Latest Test Release of XPM: v0.7.2a v2
Check bellow for what version has been applies to the servers or use the in-game XPM menu.

Left 4 Dead 2
Versus Server #1- 74.100.129.219:27015 Currently: [XPM v0.7.2a v2] Vanilla
Versus Server #2- 74.100.129.219:27016 Currently: [XPM v0.7.2a v2] Vanilla
Versus Server #3- 74.100.129.219:27017 Currently: [XPM v0.7.2a v2] Vanilla
Versus Server #4- 74.100.129.219:27018 Currently: [XPM v0.7.2a v2] Vanilla
Versus Server #5- 74.100.129.219:27019 Currently: [XPM v0.7.2a v2] Vanilla Zombie Character Select
Versus Server #6- 74.100.129.219:27021 Currently: [XPM v06.7] Increased Witches + Passive Talents + Mini Tanks
Versus Server #7- 74.100.129.219:27022 Currently: [XPM v0.6.7] Increased Witches + Passive Talents + Mini Tanks
Versus Server #8- 74.100.129.219:27023 Currently: [XPM v0.6.7] Zombie Character Select
Versus Server #9- 74.100.129.219:27024 Currently: [XPM v0.6.7] Zombie Character Select
Versus Server #10- 74.100.129.219:27025 Currently: [XPM v0.6.7] Tank Rush
Versus Server #11- 74.100.129.219:27026 Currently: Stock
Versus Server #12- 74.100.129.219:27027 Currently: Stock
Versus Server #13- 74.100.129.219:27028 Currently: Stock
Versus Server #14- 74.100.129.219:27029 Currently: Stock
Versus Server #15- 74.100.129.219:27031 Currently: Stock
{Panda} Server #1- 74.100.129.219:27046 Currently: [XPM v0.6.7] Zombie Character Select
{Panda} Server #2- 74.100.129.219:27040 Currently: [XPM v0.6.7] Zombie Character Select
{Panda} Server #3- 74.100.129.219:27045 Currently: [XPM v0.6.7] SuperVersus