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Updated:January 17, 2018
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This document describes how to troubleshoot Cisco Unified Border Element (SP Edition) (CUBE SP) when it rejects the internal call, which is config fowarded to PSTN number.
Call Flow: Internal IP phone 4002 calls internal IP phone 4001, all calls on ip phone 4001 are foward to a configured PSTN number.
Problem: Caller Hears Fast Busy Tone when Calls from IP Phone 4002 to 4001
Caller uses IP Phone 1 to call another IP Phone 2, the IP Phone 2 is configured to forwad all calls to an exteral PSTN number . the call failed to connect the PSTN Phone, PSTN phone does not ring and the caller hears fast busy tone.
These are the steps to troubleshoot the issue.
Step 1. Cisco Unified Communication Manager (CUCM) Log Analysis.
From CUCM logs, can see error message coming from CUBE SP.
SIP/2.0 604 Does Not Exist Anywhere
SIP/2.0 604 Does Not Exist Anywhere from cube SP
82645958.001 |13:08:46.297 |AppInfo |SIPTcp - wait_SdlSPISignal: Outgoing SIP TCP message to 10.4.15.253 on port 5060 index 18491
INVITE sip:+email@example.com:5060 SIP/2.0
Via: SIP/2.0/TCP 10.4.15.5:5060;branch=z9hG4bK3cc7264a831cc4
Date: Fri, 17 Nov 2017 02:08:46 GMT
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
CSeq: 101 INVITE
Allow-Events: presence, kpml
P-Asserted-Identity: x <sip:+firstname.lastname@example.org>
Remote-Party-ID: x <sip:+email@example.com>;party=calling;screen=yes;privacy=off
Step 2. CUBE SP Log Analysis.
From CUBE SP logs, you can see that the call did not pass source number analsysis, as it does not match any entry.