Noise over ISDN

[nelson.vieira]

Good Morning,

I have a OXE release 9.0 H130150a entirely suporting IP sets and trunks. All works fine.
Now I am connecting some ISDN lines to the system using a MIX Board. When i make a call over the isdn line i listen some metalic noise like robotic voice. The line is good (no problems connected to a OXO).

┌─Review/Modify: Trunk Group──────────────────────────────────────────────┐
│ │
│ Node Number (reserved) : 1 │
│ Trunk Group ID : 21 │
│ Instance (reserved) : 1 │
│ │
│ Trunk Group Type + T0 │
│ T2 Specification + None │
│ Public Network Ref. : ------ │
│ VG for non-existent No. + YES │
│ Entity Number : 0 │
│ Supervised by Routing + NO │
│ VPN Cost Limit for Incom.Calls : 0 │
│ Immediate Trk Listening if VPNCall + YES │
│ VPN TS % : 50 │
│ CSTA-Monitored + NO │
│ Max.% of trunks out CCD : 0 │
│ Ratio analog.to ISDN cost : ------ │
│ TS Distribution on Accesses + YES │
│ Quality profile for voice over IP + Always VoIP │
│ IP Compression Type + Default │
│ Use of volume in system + YES │
│ Announcement for dial tone + NO │
│ Announcement for Ring tone + NO │
│ Private to Public Overflow + YES │
│ End-to-end dialing + NO │
│ DTMF end-to-end signal. + NO │
│ Trunk group used in DISA + NO │
│ DISA Secret Code : ---- │
│ Routing To Manager + NO │
│ Trunk COS : 19 │
│ Sending of Progress message + YES │
│ No. of digits unused (ISDN) : 0 │
│ B Channel Choice + NO │
│ Channels: Attendant Control (Rsvd) : 0 │
│ Redirection For ACD (Dissuasion) + NO │
│ DTO joining + NO │
│ Consultation Call On B Channel + NO │
│ Automated Attendant + NO │
│ Calling party Rights COS : 0 │
│ TS Overflow + YES │
│ Number To Be Added : -------- │
│ Charge Calling And ADN Creation + NO │
│ Use Split Access + NO │
│ Heterogeneous Remote Network + NO │
│ COS Restrictions - Barring mode + Not Restricted / Not barred │
│ ARS Class of service : 31 │
│ External Access Server + NO │
│ │
└─────────────────────────────────────────────────────────────────────────┘


Can someone help me ?

Thanks.

[jpissot]

Have you verify the compression of your system.

Do you use or not compression inter your GD and your ipphone set? Your domain are well configured?

[redimprezza]

Also please see that you have configured your qos well, cause latency packet drops could also associated with your issue. But most importantly or firstly check all your layer 1 is new, no loose connectors and up to standard as a result there are sometimes IP bottle necks which cause udp packets to behave as such.