SIP Server& Terminal （P2P）:
surport both udp and tcp

RadVision SIP Proxy Server

OK

IpTel SIP Proxy Server

OK

Seawolftec XRainbow SIP Proxy Server

OK

Sipphone

OK

freeworldialup

OK

inphonex

OK

PA1688

OK

Grand Stream Budge Tone-100

OK

CISCO 5300

OK

AudioCode(Canada )

OK

Vbuzzer

OK

Asterisk

OK

Stanaphone

OK

Sinosip

OK

Deltathree

OK

Huawei SoftX3000

OK

SIP Express Router

OK

ZTE ZXSS10 SS1

OK

ASAHI Net（Japan）

OK

WalkerSun

OK

Auv Tech. IP-PBX

OK

Auv Tech. Server(including using encryption)

OK

UT softSwitch

OK

nikotel

OK

DaDong SIP Server

OK

Sipgate.co.uk

OK

Koncept USA

OK

Gossiptel（sip.gossiptel.com）

OK

Sonus Softswitch

OK

vxSIP(icyhe)/2.4.1-beta0

OK

ISP from Peru（216.151.149.35）

OK

Xiameng Tietong

OK

Shenzhen Xingli

OK

PartySIP 0.5.2-win32

OK

VOCAL 1.5.0

OK

OnDO SIP server

OK

Siemens SCS SIP Proxy 1.0.0.3 Rel

OK

BOET

OK

Pagoo IP Voice Platform

OK

Lucent ESE/VSE Platform

OK

Shenzhen GW

OK

Shanghai Tietong

OK

PartySip

OK

SipX

OK

Berkeley SIP server

OK

Brekeke SIP Server

OK

Open SER

OK

OnDO SIP Server

OK

Nortel Server

OK

Xener Server

OK

MicrioSoft Response Point

OK