[cisco-voip] Special considerations for IAD or PRI network-emulation on Cisco hardware...
Jeff Anderson
ciscoplumber at gmail.com
Thu May 7 11:51:59 EDT 2009
Hi Wes:
Below are the config snippets you requested. I dont see any issues with
slips.
Thanks, Jeff
network-clock-participate T1 1/0
network-clock-participate T1 1/1
network-clock-select 1 T1 1/1
controller T1 1/0
framing esf
clock source internal
linecode b8zs
cablelength short 133
pri-group timeslots 1-24
description PRI TO PBX
!
controller T1 1/1
framing esf
linecode b8zs
channel-group 0 timeslots 1-24
description T1 TO MPLS Provider
interface Serial1/0:23
description PRI TO PBX
no ip address
encapsulation hdlc
no logging event link-status
isdn switch-type primary-ni
isdn protocol-emulate network
isdn incoming-voice voice
no cdp enable
!
interface Serial1/1:0
description T1 to MPLS Provider
ip address x.x.x.x 255.255.255.252
no logging event link-status
service-policy output SERIAL_DYNAMIC_1536
voice-port 1/0:23
router#sh controllers t1
T1 1/0 is up.
Applique type is Channelized T1
Cablelength is short 133
Description: PRI TO PBX
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
RX level = 0dB
Framing is ESF, Line Code is B8ZS, Clock Source is Internal.
Data in current interval (513 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 24 hours)
0 Line Code Violations, 0 Path Code Violations,
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
T1 1/1 is up.
Applique type is Channelized T1
Cablelength is long gain36 0db
Description: T1 TO MPLS PROVIDER
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
RX level = -1dB
Framing is ESF, Line Code is B8ZS, Clock Source is Line.
Data in current interval (514 seconds elapsed):
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
Total Data (last 24 hours)
0 Line Code Violations, 0 Path Code Violations,
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins,
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
router#sh voice port 1/0:23
ISDN 1/0:23 Slot is 1, Sub-unit is 0, Port is 23
Type of VoicePort is ISDN-VOICE
Operation State is DORMANT
Administrative State is UP
The Last Interface Down Failure Cause is Administrative Shutdown
Description is not set
Noise Regeneration is enabled
Non Linear Processing is enabled
Non Linear Mute is disabled
Non Linear Threshold is -21 dB
Music On Hold Threshold is Set to -38 dBm
In Gain is Set to 0 dB
Out Attenuation is Set to 0 dB
Echo Cancellation is enabled
Echo Cancellation NLP mute is disabled
Echo Cancellation NLP threshold is -21 dB
Echo Cancel Coverage is set to 64 ms
Echo Cancel worst case ERL is set to 6 dB
Playout-delay Mode is set to adaptive
Playout-delay Nominal is set to 60 ms
Playout-delay Maximum is set to 250 ms
Playout-delay Minimum mode is set to default, value 40 ms
Playout-delay Fax is set to 300 ms
Connection Mode is normal
Connection Number is not set
Initial Time Out is set to 10 s
Interdigit Time Out is set to 10 s
Call Disconnect Time Out is set to 60 s
Ringing Time Out is set to 180 s
Wait Release Time Out is set to 30 s
Companding Type is u-law
Region Tone is set for US
Station name None, Station number None
Translation profile (Incoming):
Translation profile (Outgoing):
Voice class called number pool:
DS0 channel specific status info:
IN OUT
PORT CH SIG-TYPE OPER STATUS STATUS TIP RING
1/0:23 01 isdn-voice dorm none none
1/0:23 02 isdn-voice up none none
1/0:23 03 isdn-voice dorm none none
1/0:23 04 isdn-voice dorm none none
1/0:23 05 isdn-voice dorm none none
1/0:23 06 isdn-voice dorm none none
1/0:23 07 isdn-voice dorm none none
1/0:23 08 isdn-voice dorm none none
1/0:23 09 isdn-voice dorm none none
1/0:23 10 isdn-voice dorm none none
1/0:23 11 isdn-voice dorm none none
1/0:23 12 isdn-voice dorm none none
1/0:23 13 isdn-voice dorm none none
1/0:23 14 isdn-voice dorm none none
1/0:23 15 isdn-voice dorm none none
1/0:23 16 isdn-voice dorm none none
1/0:23 17 isdn-voice dorm none none
1/0:23 18 isdn-voice dorm none none
1/0:23 19 isdn-voice dorm none none
1/0:23 20 isdn-voice dorm none none
1/0:23 21 isdn-voice dorm none none
1/0:23 22 isdn-voice dorm none none
1/0:23 23 isdn-voice dorm none none
router#sh network-clocks
Network Clock Configuration
---------------------------
Priority Clock Source Clock State Clock Type
1 T1 1/1 GOOD T1
6 Backplane GOOD PLL
Current Primary Clock Source
---------------------------
Priority Clock Source Clock State Clock Type
1 T1 1/1 GOOD T1
router#sh ver
Cisco IOS Software, 2400 Software (C2430-IS-M), Version 12.4(15)T7, RELEASE
SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Wed 13-Aug-08 15:51 by prod_rel_team
ROM: System Bootstrap, Version 12.4(13r)T7, RELEASE SOFTWARE (fc1)
UnitedPrairie_Owatonna uptime is 2 weeks, 16 hours, 2 minutes
System returned to ROM by power-on
System image file is "flash:c2430-is-mz.124-15.T7.bin"
Cisco IAD2431 (R527x) processor (revision 4.1) with 119808K/11264K bytes of
memory.
Processor board ID FHK1238F1MR
R527x CPU at 225MHz, Implementation 40, Rev 3.1
2 FastEthernet interfaces
25 Serial interfaces
2 Channelized T1/PRI ports
DRAM configuration is 64 bits wide with parity disabled.
63K bytes of non-volatile configuration memory.
System fpga version is 250027
System readonly fpga version is 250027
Option for system fpga is 'system'.
62720K bytes of ATA System CompactFlash (Read/Write)
Configuration register is 0x101
On Wed, May 6, 2009 at 9:32 PM, Wes Sisk <wsisk at cisco.com> wrote:
> So you have 2 T1's terminated on the same IAD? Are they in the same module
> or what? There are some interesting things that happen with multiple
> clocked circuits terminated on these boxes. Can you clarify which
> interfaces you are using for what on the IAD? Config snippets always
> welcome.
>
> /Wes
>
>
>
> On Wednesday, May 06, 2009 5:00:03 PM, Jeff Anderson
> <ciscoplumber at gmail.com> <ciscoplumber at gmail.com> wrote:
>
> I have a couple of customers who are experiencing poor audio using an
> IAD to connect their PBX to our h.323 PSTN GW.
>
> Basic Layout.
>
> Customer PBX PRI > IAD PRI (Network-emulate) converted to VoIP > MPLS
> enabled T1 > Core > AS5850 (VoIP converted to TDM) > PSTN.
>
> The customer reports that poor audio is experienced inbound into their PBX.
> They say their outbound audio is okay. This doesnt happen on every call but
> we do have more than one customer reporting the issue.
>
> The audio can be described anywhere from echo, cutting out or distorted
> audio. The problem has also been reported by users who have 38xx series
> gateways so i dont think the problem is IAD specific. The AS5850 is a shared
> device used by many different customers, the majority of which connect using
> Cisco IP phones and this demographic of customers are not reporting the
> problem.
>
> I have done packet captures on the AS5850 and there is no packet loss
> reported, the packets arrive in sequence and the jitter is very low.
>
> In my testing, I have found double-talk to cause the far end audio (AS5850)
> to cut-out. All the packets arrive but they contain a payload value of 7F.
> Some improvement can be made to this condition by disabling non-linear
> progression.
>
>
>
> My questions for the community are related to experiences or lessons
> learned from using PRI network emulate.
>
> Can there be too many echo cancellers in the call flow? (i.e. Customer PBX
> UC500 with Cisco PRI, IAD PRI, AS5850 PRI all with echo cancellers)
>
> Does the cable length command have any bearing on voice quality?
>
> Are there any special commands i should enter when connecting back to back
> wth a T1 cable (echo-cancel coverage, nlp, etc)?
>
> Is a 2 pair sheilded T1 cable necessary for the PRI back to back connection
> of less than 20 ft?
>
>
> Any insight or suggestions would be greatly appreciated.
>
> Thanks,
>
> Jeff
>
>
>
> ------------------------------
>
> _______________________________________________
> cisco-voip mailing listcisco-voip at puck.nether.nethttps://puck.nether.net/mailman/listinfo/cisco-voip
>
>
>
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