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Cisco Bug: CSCun41068 - VWIC3 faces one-way audio with few Service Providers(VWIC2 works fine)

Last Modified

Nov 27, 2020

Products (1)

  • Cisco 3900 Series Integrated Services Routers

Known Affected Releases

15.2(4)M4.3

Description (partial)

Symptom:
VWIC3 faces no-audio(no ringback) on Outbound calls. Inbound calls work fine. 
VWIC2 works absolutely fine. This happens with only few Service Provider(like Alcatel).

Conditions:
This happens with only few Service Providers(like Alcatel 1642). With VWIC2 works all fine. In the RIN you see audio but you do not get SIN/SOUT in PCM or get muted audio in SIN/SOUT if you get it.
Applies to all IOS

Applies to ISRG2(3945 platform specifically checked)

Not a HW issue as applies to all 3945 having VWIC3 going to the provider.

Only Outbound calls face the issue. Inbound calls work fine.
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Bug Details Include

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