I'm having difficulties with outging calls - some calls, from some phones(randomly), are not connected - the LCD shows call proceed but there is no ring tone, no voice transmission. When you try to dial the number again the call is usually connected immediatelly. We are running CCM 4.0(2a)sr2c with phone load 7.2(4.0) - after the FW upgrade, I have the feeling that it's not that common but still happens (several times a day).
I also tried to search the log, but did not find anything suspicious.
I have had a similar situation where the calls were connecting, so the signaling was good, but had one or no-way audio. Once I found the signaling working, I ruled out the CM as being an issue.
In my case, I was using a 2600 with a NM-HDV connected to a PRI. I found that I had bad DSP modules in this NM-HDV which caused the audio to inconsistantly fail. I'm not sure that this is your case, but thought I'd offer advice from a similar situation.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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