How To Easily Disable SIP ALG On Any Router - JUXTO - Enterprise Real-Time Communications Solutions
SIP Trunking
disablesipalg [support wiki]
Enterprise Session Border Controller with 2 Ethernet ports supports up to 1000 SIP-to-SIP calls | SmartNode SN5600 from Patton.
The Ultimate Wholesale SIP Trunking Guide - SIPTRUNK
SIP trunk node - configuration - Zenitel Wiki
Amazon.com: 2-Port VoIP SIP Phone Adapter - GT202 Wireless Router, Supports WiFi Asterisk ATA VOS FXS Fax. Suitable for Home or Business (Black) : Office Products