Support / Voice / SBC / AudioCodes

AudioCodes Mediant SBC trunk to VoiceTel.

Mediant SBC trunk configuration is a four-object dance: Proxy Set, IP Group, IP Profile, and Classification rule. Set them up in order and the trunk registers cleanly.

1. Proxy Set

Open Setup → Signaling & Media → Core Entities → Proxy Sets → Add:

  • Name: VoiceTel-PS
  • SBC IPv4 SIP Interface: the SBC's WAN interface
  • Proxy Address: the SIP server host shown in your customer portal (port 5060, transport UDP)
  • Proxy Keep-Alive: Using OPTIONS (every 30 seconds)

2. IP Group

Open Setup → Signaling & Media → Core Entities → IP Groups → Add:

  • Name: VoiceTel-IPG
  • Type: Server
  • Proxy Set: VoiceTel-PS (created above)
  • Authentication Mode: Authentication per Call (or per User if VoiceTel issued user-level credentials)
  • SIP Group Name: the SIP server host shown in your customer portal (used in Request-URI)
  • Inbound Message Manipulation Set: -1 (none, unless engineering supplied one)
  • Outbound Message Manipulation Set: -1

3. IP Profile

Open Setup → Signaling & Media → Coders & Profiles → IP Profiles → Add:

  • Name: VoiceTel-IPP
  • SBC Codecs: G.711µ-law, G.711a-law, G.729
  • SBC Reliable Provisional Response: Supported (for PRACK)
  • SBC Send REGISTER: Yes (if Digest auth) or No (IP auth)
  • SBC Auth Mode: matches IP Group
  • SBC Local SDP / Late Media: No
  • Disconnect on Broken Connection: Yes

Bind the profile to the IP Group from step 2.

4. Classification rule

Open Setup → Signaling & Media → SBC → Classification → Add:

  • Name: VoiceTel-Classify
  • Source IP Group: Any (or specific VoiceTel IP range if engineering provided one)
  • Source SIP Interface: WAN
  • Destination IP Group: the IP Group representing your downstream PBX
  • Routing Action: Route to IP Group (PBX)

5. Account (for Digest auth only)

Open Setup → Signaling & Media → SIP Definitions → Accounts → Add:

  • Served IP Group: your downstream PBX IP Group
  • Serving IP Group: VoiceTel-IPG
  • Username: SIP username from VoiceTel onboarding
  • Password: SIP password from onboarding
  • Host Name: the SIP server host shown in your customer portal
  • Register: yes (Digest) or no (IP auth)

Verify

Open Monitor → Monitor → SBC → IP Groups. The VoiceTel-IPG status should be Up (OPTIONS responding). Place a test call from a downstream PBX extension; watch Monitor → SIP → Active Calls for the call to appear and traverse cleanly.