Cisco 2821 VOIP 不支持30 channels in g729r8
问题描述：PBX 与voice gateway (Cisco 2821)通过E1连接，提供30路tie line,开始使用正常，后来使用者增加了以后陆续出现拨号无任何反应等问题。
环境：
VG>show version
Cisco IOS Software, 2800 Software (C2800NM-SPSERVICESK9-M), Version12.3(11)
RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2005 by Cisco Systems, Inc.
Compiled Wed 05-Oct-05 23:39 by kehsiao
ROM: System Bootstrap, Version 12.4(13r)T5,> Sumida-CLab-VG uptime is 11 weeks, 5 days, 21 hours, 32 minutes
System returned to ROM by power-on
System image file is "flash:c2800nm-spservicesk9-mz.123-11.T8.bin"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may befound a
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
export@cisco.com.
Cisco 2821 (revision 53.50) with 249856K/12288K bytes of memory.
Processor board> 2 Gigabit Ethernet interfaces
1 Channelized E1/PRI port
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
VG>
PBX Model:NEC IPX 2400
VOIP 编码方式 codec g729r8 bytes 80
原因：
VG#show diag
Slot 0:
C2821 Motherboard with 2GE and integrated *** Port adapter, 2ports
Port adapter is analyzed
Port adapter insertion time unknown
EEPROM contents at hardware discovery:
PCB Serial Number : FOC11145XEQ
Hardware Revision : 1.0
Top Assy. Part Number : 800-26921-03
Board Revision : B0
Deviation Number : 0
Fab Version : 03
RMA Test History : 00
RMA Number : 0-0-0-0
RMA History : 00
Processor type : 87
Hardware date code : 20070424
Chassis Serial Number : FHK1119F1ZR
Chassis MAC Address : 001b.d476.9958
MAC Address block> CLEI Code : COM7M00ARA
Product (FRU) Number : CISCO2821
Part Number : 73-8853-05
Version> EEPROM format version 4
EEPROM contents (hex):
0x00: 04 FF C1 8B 46 4F 43 31 31 31 34 35 58 45 51 40
0x10: 03 E8 41 01 00 C0 46 03 20 00 69 29 03 42 42 30
0x20: 88 00 00 00 00 02 03 03 00 81 00 00 00 00 04 00
0x30: 09 87 83 01 32 40 18 C2 8B 46 48 4B 31 31 31 39
0x40: 46 31 5A 52 C3 06 00 1B D4 76 99 58 43 00 20 C6
0x50: 8A 43 4F 4D 37 4D 30 30 41 52 41 CB 8F 43 49 53
0x60: 43 4F 32 38 32 31 20 20 20 20 20 20 82 49 22 95
0x70: 05 89 56 30 34 00 D9 02 40 C1 FF FF FF FF FF FF
PVDM Slot 0:
32-channel (G.711) Voice/Fax PVDMII DSP SIMM PVDM daughtercard
Hardware Revision : 4.0
Part Number : 73-8539-05
Board Revision : A0
Deviation Number : 0
Fab Version : 04
PCB Serial Number : FOC10414WD8
RMA Test History : 00
RMA Number : 0-0-0-0
RMA History : 00
Processor type : 00
Product (FRU) Number : PVDM2-32
Version> EEPROM format version 4
EEPROM contents (hex):
0x00: 04 FF 40 03 EE 41 04 00 82 49 21 5B 05 42 41 30
0x10: 88 00 00 00 00 02 04 C1 8B 46 4F 43 31 30 34 31
0x20: 34 57 44 38 03 00 81 00 00 00 00 04 00 09 00 CB
0x30: 88 50 56 44 4D 32 2D 33 32 89 56 30 31 20 D9 02
0x40: 40 C1 FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x50: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x60: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x70: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
WIC Slot 0:
E1 (1 port) Multi-Flex Trunk WAN daughter card
Hardware revision 1.0 Board revision D0
Serial number 31366350 Part number 800-04475-03
Test history 0x0 RMA number 00-00-00
Connector type PCI
EEPROM format version 1
EEPROM contents (hex):
0x20: 01 21 01 00 01 DE 9C CE 50 11 7B 03 00 00 00 00
0x30: 68 00 00 00 03 12 26 00 FF FF FF FF FF FF FF FF
VG#
可以看出此vG 提供了一块 PVDM2-32 子卡。
PVDMPacket Voice DSP Module (Cisco router feature)
查询data sheet
PVDM2-32 32-Channel Packet Fax/Voice DSP Module 2 DSPs (TI 2510)
http://www.net527.cn/uploads/allimg/100517/09440M442-0.jpghttp://www.net527.cn/uploads/allimg/100517/09440G423-1.jpg
用户使用G.729时，pvdm2-32支持最大channel数为12 。
解决方法：
增加PVDM子卡，或者跟换支持更多channel的PVDM子卡。
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