[cisco-voip] Voice Quality Problem

Mon May 1 06:19:41 EDT 2006

Hi,

I have a questions regarding voice quality to the PSTN.

I have a Cisco 2800 with 2 serials (E1).
When dialing internal, the voice quality is perfect.

When dialing to the pstn the voice quality is good at first and after a
period of time it gets scratchy.
This gets worse during the days.

After a reboot its ok again.

The scratchy noice is heard on the outside world and not on the Call
Manager Voip environment.

Does anyone have any idea.

voice call send-alert
voice call convert-discpi-to-prog
voice rtp send-recv
!
voice service voip 
 modem passthrough nse codec g711alaw
!
!
voice class codec 1
 codec preference 1 g711ulaw
 codec preference 2 g711alaw
 codec preference 3 g729r8
 codec preference 4 g729br8
!
!
!
voice class h323 1
 h225 timeout tcp establish 3
!
!
!
!
!

controller E1 0/0/0
 framing NO-CRC4 
 pri-group timeslots 1-31
!
controller E1 0/0/1
 framing NO-CRC4 
 pri-group timeslots 1-31
!
translation-rule 1
 Rule 1 ^0 00
!
\
!
interface Serial0/0/0:15
 no ip address
 encapsulation hdlc
 isdn switch-type primary-net5
 isdn overlap-receiving
 isdn incoming-voice voice
 isdn sending-complete
 no cdp enable
!
interface Serial0/0/1:15
 no ip address
 encapsulation hdlc
 isdn switch-type primary-net5
 isdn overlap-receiving
 isdn incoming-voice voice
 isdn sending-complete
 no cdp enable

voice-port 0/0/0:15
 echo-cancel coverage 32
 cptone NL
!
voice-port 0/0/1:15
 echo-cancel coverage 32
 cptone NL
!
!
dial-peer voice 1 pots
 preference 2
 destination-pattern 0T
 progress_ind setup enable 3
 progress_ind alert enable 8
 progress_ind progress enable 8
 direct-inward-dial
 port 0/0/0:15
!
dial-peer voice 2 pots
 preference 3
 destination-pattern 0T
 progress_ind setup enable 3
 progress_ind alert enable 8
 progress_ind progress enable 8
 direct-inward-dial
 port 0/0/1:15
!

Cisco IOS Software, 2800 Software (C2800NM-IPVOICE-M), Version 12.4(6)T,
RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2006 by Cisco Systems, Inc.
Compiled Wed 22-Feb-06 22:54 by ccai

ROM: System Bootstrap, Version 12.4(1r) [hqluong 1r], RELEASE SOFTWARE
(fc1)

PSTN-GW1 uptime is 4 days, 16 hours, 50 minutes
System returned to ROM by reload at 17:07:49 pdt Wed Apr 26 2006
System image file is "flash:c2800nm-ipvoice-mz_124-6_T.bin"

Cisco 2821 (revision 53.50) with 249856K/12288K bytes of memory.
Processor board ID FCZ100971QU
2 Gigabit Ethernet interfaces
62 Serial interfaces
2 Channelized E1/PRI ports
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
62720K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102
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