Re: ISDN BRI - poor voice quality

azam_anwar · ‎08-12-2003

I've got a 2620 with a VIC-2BRI-S/T-TE installed. However, when calls are placed/received over the PSTN via 64k isdn BRI lines , both parties experience poor quality audio(hissing/muffled). Internally all ok. No VAD.

Any feedback appreciated.

msolak · ‎08-12-2003

Hi,

check your compand-type (a- or u- laW) on the voice-ports.

mehmet

azam_anwar · ‎08-12-2003

Hi Mehmet

voice-port set to u-law with no improvement.

tim.medley · ‎08-12-2003

What type of QoS are you using? How many simultaneous calls are you trying to place at a time? Are you sure that VAD is disabled?

You might want to take a look at the following documents in regards to configuring Voice and ISDN.

http://www.cisco.com/en/US/tech/tk652/tk701/technologies_tech_note09186a00801006c6.shtml

http://www.cisco.com/en/US/products/sw/iosswrel/ps1830/products_feature_guide09186a0080087940.html

tm

Tim Medley, CWNA, CCDP, CCNP+Voice

http://www.iptnetworkers.com