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CP6921 Clicking Noise

Hello,

I hvae a problem with CP6921 noise

1. Infomation

1) CUCM Version : 9.1.1

2) Voice Gateway : C3945 (14 PRI), Two Telco (1st : 9 PRI, 2nd : 5 PRI)

3) IPPhone : CP6921 ver 9.3.1.3.ES9 (SCCP)

4) Voice Gateway <- SIP(TLS,sRTP) -> CUCM - IP-Phone(SCCP/TLS,sRTP)

5) No Slip occur., no other PRI error

2) Problem

1) Sometimes we heard clicking noise, when CP6921 call to outside via voicegateway.

2) show contr e1 0/0/0 => No slip, no other PRI error.

3) packet capture => heard clicking noise, no packet loss, no sequence error.

4) Local communication => No noise

5) CIPC outbound & Local call => No noise

Please help me, experts

Thank you.

 

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