SIP proxy, ports and codecs for provisioning

Whether you connect a PBX trunk or register handsets directly, the platform details are the same:

• SIP server / proxy: sip.transcom.net
• Ports: 5060 for UDP, 5061 for TLS (encrypted signalling)
• Codecs: G.711u (PCMU) for best quality, G.729 to save bandwidth, and G.722 for HD wideband audio
• Authentication: your account user ID and password

Across a busy twenty-five-channel deployment, G.729 can significantly reduce bandwidth if your internet connection is a constraint, while G.711u gives the cleanest audio where bandwidth allows. Most PBXs and phones will negotiate automatically from the list of codecs you allow.