[cisco-voip] Voice clipping on Cisco PRI

[Keith Burns]

Hi,

I have a customer with a PBX connected to a 2801. He says that when we both
talk (I am calling in from PSTN) he hears my voice clipping, yet I hear his
fine.

I was wondering if someone has seen this before.

Here are some configlets and version:

<snip>
isdn switch-type primary-ni
!
voice-card 0
!
!
!
voice service voip 
 fax protocol pass-through g711ulaw
 modem passthrough nse codec g711ulaw
!
controller T1 0/3/0
 framing esf
 clock source internal
 linecode b8zs
 pri-group timeslots 1-8,24
!
class-map match-all voip
 match access-group 105
!
!
policy-map llq
 class voip
  priority percent 100
 class class-default
  fair-queue
!
<snip>
interface Serial0/1/0:0.16 point-to-point
 ip address 10.20.121.1 255.255.255.252
 no cdp enable
 frame-relay interface-dlci 16 IETF protocol ip 10.20.121.2
  class T1-throttledown
!
interface Serial0/3/0:23
 no ip address
 isdn switch-type primary-ni
 isdn protocol-emulate network
 isdn incoming-voice voice
 no cdp enable
!
<snip>
map-class frame-relay T1-throttledown
 frame-relay traffic-rate 1544000 1544000
 service-policy output llq
!
access-list 105 permit ip any any precedence critical
access-list 105 permit ip any any dscp ef
!
voice-port 0/3/0:23
!
dial-peer voice 1000 voip
 application session
 destination-pattern .T
 session protocol sipv2
 session target ipv4:10.50.0.40
 codec g711ulaw
 ip qos dscp ef signaling
 no vad
!
dial-peer voice 103 pots
 application session
 destination-pattern <snip>75..
 direct-inward-dial
 port 0/3/0:23
 prefix 75
!

accurate-pri#sh ver
Cisco IOS Software, 2801 Software (C2801-IPVOICE-M), Version 12.3(11)T5,
RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Sat 02-Apr-05 21:22 by yiyan

ROM: System Bootstrap, Version 12.3(8r)T8, RELEASE SOFTWARE (fc1)

accurate-pri uptime is 3 weeks, 5 days, 2 hours, 39 minutes
System returned to ROM by reload at 22:37:40 UTC Sat May 13 2006
System image file is "flash:c2801-ipvoice-mz.123-11.T5.bin"

Cisco 2801 (revision 5.0) with 115712K/15360K bytes of memory.
Processor board ID FTX0946Y355
2 FastEthernet interfaces
10 Serial interfaces
2 Channelized T1/PRI ports
1 DSP, 8 Voice resources
DRAM configuration is 64 bits wide with parity disabled.
191K bytes of NVRAM.
62720K bytes of ATA CompactFlash (Read/Write)

Configuration register is 0x2102

!
Any help greatly appreciated!

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