300-070 · Question #199
300-070 Question #199: Real Exam Question with Answer & Explanation
The correct answer is B: voice service voip. A '403 Forbidden' error from Cisco Unified Border Element (CUBE) during a SIP call typically indicates that the CUBE is rejecting the incoming SIP request because the source IP address is not trusted or because SIP-to-SIP call routing is not explicitly permitted. The two most com
Question
Options
- Avoice service voip
- Bvoice service voip
- Cvoice service voip
- Dvoice service voip
- Evoice service voip
Explanation
A '403 Forbidden' error from Cisco Unified Border Element (CUBE) during a SIP call typically indicates that the CUBE is rejecting the incoming SIP request because the source IP address is not trusted or because SIP-to-SIP call routing is not explicitly permitted. The two most common fixes applied under the 'voice service voip' configuration context are: (1) adding 'allow-connections sip to sip' to explicitly permit SIP-to-SIP call routing through the CUBE (without this, CUBE drops inter-SIP calls by default in many IOS versions), and (2) configuring IP address trust - either by adding the peer's IP to the trusted list via 'ip address trusted list' or disabling strict source validation with 'no ip address trusted authenticate' - so that CUBE does not reject the signaling from an untrusted source. The dial-peer configurations shown (g722-64 codec, h264 video, rtp-nte DTMF) are valid and are not the source of the 403 error, so the fix must be at the global voice service voip level.
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