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Cisco Bug: CSCtd42930 - White noise for IPPE dial in coming from PSTN via multiple CUCM hops

Last Modified

Jun 25, 2018

Products (1)

  • Cisco IPICS Server Software

Known Affected Releases


Description (partial)


Noticing audio quality issue with 4.0 DMS (IPPE) over PSTN  wherein the server plays back lot of  white noise whenever it plays out the IVR prompts. 

The topology looks something like:

PSTN user -> PSTN GW -> (via PRI) -> CUCM1 -> (via H323 trunk) -> CUCM2 -> (via SIP trunk) -> IPPE.

This works absolutely fine for IPICS 2.2. However when I point the SIP trunk from CUCM2 to a 4.0 server I start hearing this noise whenever the IVR prompts are getting played.  

If I take out CUCM2 out of the picture, it works for ipics 4.0. The topology in this case looks something like:

PSTN user -> PSTN GW -> (via PRI) -> CUCM1 -> (via SIP trunk) -> IPPE

IPICS 2.2(1) - IPICS 4.5(1)
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