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CISCO_CVoice–002:模拟与数字中继-创新互联

在这部分里,因为没有物理语音实验设备,无法做实验。此篇主要以整理概念为主。

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  1. 语音基本概念

分类

接口

中继线

模拟

数字

模拟

数字

传统语音

FXS, FXO, E&M

E1, T1

PSTN

E1(2.048M),

T1(1.544M)

IP语音

语音的连接是建立在IP的通道之上的,信令一般有: H323,SIP,SCCP,MGCP

  2.     一般连接方式

传统语音:

Tel – FXS – CME --- (PSTN, TI, E1 ) --- CME – FXS – Tel

//这里可能会有一点误区,老一点企业的IT环境中,这里基本上是用PBX,然后通过配架将模拟电话连接到桌面,通过跟ISP申请的几门号码作为中继线路与外界联系。

这里因为讨论的是cisco的相关技术,所以用cisco的语音设备代替PBX //

CME上的连接组合有:

模拟:一路通讯占用一路通道

FXS – FXO, FXO – FXS

E&M – E&M : 一般用于CME到PBX(具有callrouting能力的设备)之间连接

数字:能支持多路并发通讯

T1 –T1 :24路并发通讯,每个通道64K

E1 – E1 : 30路并发通讯,每个通道64K

IP 语音:基于报文交换技术

常用连接方案:

phone---(PBX)—router------internet-----router—(PBX)—phone

此方案的优势在于:
1. 减少费用
2. 减少IT的维护量,将所有的设备集中到router中统一维护
3. 更多的基于IP的应用

3. CISCO语音硬件选择

对于硬件的选择可以参考如下连接

http://www.cisco.com/c/en/us/products/unified-communications/index.html

PVDM: packet voice dsp module , 分组语音DSP模块。

DSP:数字信号处理器

在执行编解码的过程中,设备一般采用flexible(弹性)模式,每个DSP处理的会话数:

PVDM I:  4 sessions / 1 DSP

PVDM II : 16 sessions / 1 DSP

PVDM III: 32 sessions / 1 DSP

4. 检查设备是否具备语音的能力命令

  1. 1Sh diag : 硬件是否具有语音模块,如:FXS,FXO,E1,T1

  2. 2   Sh voice dsp detail: 是否具有DSP资源

  3. 3   Sh ver : IOS版本是否支持语音特性,一般要ipvoice / enterprise …

截图:本想截点图,但不能直接贴在这儿,贴点文字吧:

sh diag:

       PVDM Slot 0:
       32-channel (G.711) Voice/Fax PVDM3 DSP DIMM PVDM daughter card

       WIC Slot 2:
       VIC2 - BRI-NT/TE Voice daughter card (2 port)

       WIC Slot 3:
       VIC2 - BRI-NT/TE Voice daughter card (2 port)

也可以用sh inventory

NAME: "CISCO2921/K9 chassis", DESCR: "CISCO2921/K9 chassis"
PID: CISCO2921/K9     , VID: V06 , ,

NAME: "2nd generation two port BRI voice interface daughtercard on Slot 0 SubSlot 2", DESCR: "2nd generation two port BRI voice interface daughtercard"
PID: VIC2-2BRI-NT/TE= , VID: V ,

NAME: "2nd generation two port BRI voice interface daughtercard on Slot 0 SubSlot 3", DESCR: "2nd generation two port BRI voice interface daughtercard"
PID: VIC2-2BRI-NT/TE= , VID: V ,

NAME: "PVDM3 DSP DIMM with 32 Channels on Slot 0 SubSlot 4", DESCR: "PVDM3 DSP DIMM with 32 Channels"
PID: PVDM3-32         , VID: V01 ,

NAME: "C2921/C2951 AC Power Supply", DESCR: "C2921/C2951 AC Power Supply"
PID: PWR-2921-51-AC   , VID: V03 ,

sh voice dsp detailed: 太多了,少贴点吧:

sh voice dsp detailed

DSP DSP               DSPWARE CURR BOOT                        PAK    TX/RX
TYPE NUM CH CODEC      VERSION STATE STATE  RST AI VOICEPORT TS ABORT PACK COUNT
==== === == ======== ========== ===== ======= === == ========= == ===== ============
edsp 0001 01 g729r8 p 0.1 IDLE 50/0/1.1
edsp 0002 02 g729r8 p 0.1 IDLE 50/0/1.2
edsp 0003 01 g711ulaw 0.1 IDLE 50/0/2.1
edsp 0004 02 g711ulaw 0.1 IDLE 50/0/2.2
edsp 0005 01 g729r8 p 0.1 IDLE 50/0/3.1
edsp 0006 02 g729r8 p 0.1 IDLE 50/0/3.2
edsp 0007 01 g711ulaw 0.1 IDLE 50/0/4.1
edsp 0008 02 g711ulaw 0.1 IDLE 50/0/4.2
edsp 0009 01 g711ulaw 0.1 IDLE 50/0/5.1
edsp 0010 02 g711ulaw 0.1 IDLE 50/0/5.2
edsp 0011 01 g711ulaw 0.1 IDLE 50/0/7.1
edsp 0012 02 g711ulaw 0.1 IDLE 50/0/7.2
edsp 0013 01 g711ulaw 0.1 IDLE 50/0/8.1
edsp 0014 02 g729r8 p 0.1 IDLE 50/0/8.2
edsp 0015 01 g711ulaw 0.1 IDLE 50/0/9.1
edsp 0016 02 g729r8 p 0.1 IDLE 50/0/9.2
edsp 0017 01 g711ulaw 0.1 IDLE 50/0/10.1
........

...........

......

----------------------------FLEX VOICE CARD 0 -----------------------

                          *DSP VOICE CHANNELS*

CURR STATE : (busy)inuse (b-out)busy out (bpend)busyout pending
LEGEND    : (bad)bad   (shut)shutdown (dpend)download pending

DSP   DSP                DSPWARE CURR BOOT                        PAK  TX/RX
TYPE  NUM CH CODEC       VERSION STATE STATE  RST AI VOICEPORT TS ABRT PACK COUNT
====== === == ========= ========== ===== ======= === == ========= == ==== ============
SP2600 001 01 g711ulaw     28.3.5 busy idle     0 0 0/2/1    04   0   1979/2536
SP2600 001 02 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 03 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 04 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 05 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 06 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 07 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 08 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 09 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 10 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 11 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 12 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 13 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 14 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 15 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 16 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 17 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 18 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 19 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 20 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 21 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 22 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 23 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 24 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 25 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 26 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 27 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 28 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 29 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 30 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 31 None         28.3.5 idle idle     0 0                0         0/0
SP2600 001 32 None         28.3.5 idle idle     0 0                0         0/0
                          *DSP SIGNALING CHANNELS*
DSP   DSP                DSPWARE CURR BOOT                        PAK  TX/RX
TYPE  NUM CH CODEC       VERSION STATE STATE  RST AI VOICEPORT TS ABRT PACK COUNT
====== === == ========= ========== ===== ======= === == ========= == ==== ============
------------------------END OF FLEX VOICE CARD 0 ----------------------------

sh ver

..........

..........

License Info:

License UDI:

-------------------------------------------------
Device#  PID                  SN
-------------------------------------------------
*0       CISCO2921/K9

Technology Package License Information for Module:'c2900'

-----------------------------------------------------------------
Technology   Technology-package          Technology-package
             Current      Type          Next reboot
------------------------------------------------------------------
ipbase       ipbasek9     Permanent     ipbasek9
security     None         None          None
uc           uck9         Permanent     uck9
data         None         None          None

Configuration register is 0x2102

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