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Cisco Systems 3600 manual

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Table of contents for the manual

  • Page 1

    Configuring Voice over IP for the Cisco 3600 Series VC-13 Configur ing V oice o v er IP f or the Cisco 3600 Ser ies This chapter shows you ho w to configure V oice ov er IP (V oIP) on the Cisco 3600 series. For a description of the commands used to configur e V oice ov er IP , refer to the “V oice-Related Commands” chapter in the V oice, V ideo[...]

  • Page 2

    List of Terms VC-14 Voice, Video, and Home Applications Confi guration Guide 5 The session application then runs the H.323 sessi on protocol to establish a transmission and a reception channel for each direction over the IP network. If the call is being handled b y a PBX, the PBX forwards the call to the destination teleph one. If RSVP has been con[...]

  • Page 3

    Prerequisite Tasks Configuring Voice over IP for the Cisco 3600 Series VC-15 PBX —Pri vate Branch Exchange. Pri vately-o wned central switching of fice. PLAR —Priv ate Line Au to Ringdown. This type of service results in a call attempt to some particular remote endpoint when the local extension is taken off-k ey . PO TS —Plain Old T elephone [...]

  • Page 4

    Voice over IP Conf iguration Task Li st VC-16 Voice, Video, and Home Applications Confi guration Guide V oice over IP Configuration T ask List T o conf igure V oice over IP on the Cisco 3600 s e ries, you need to complete the following tasks: 1 Configure IP Networks fo r Real-Time V oice T raf fic Configure your IP network to su pport real-tim e vo[...]

  • Page 5

    Configure IP Networks fo r Real-Time Voice Traffic Configuring Voice over IP for the Cisco 3600 Series VC-17 (b) V oIP—Dial peer describing the characteristics of a packet ne twork connection; in the case of V oice over IP , th is is an IP network. V oIP peers point to specific V oIP devices. T o minimally configure a V oIP peer , you need to con[...]

  • Page 6

    Configure IP Networks for Real-Time Voice Traffic VC-18 Voice, Video, and Home Applications Confi guration Guide The important thing to remem ber is that QoS must be configured throughout you r network—not just on the Cisco 3600 series devices running V oIP—to improve v oice network performance. Not all QoS techniques are appropriate for al l n[...]

  • Page 7

    Configure Multilink PPP with Interleaving Configuring Voice over IP for the Cisco 3600 Series VC-19 Configure Multilink PPP with Interl ea ving Multi-class Multilink PPP Interleaving allo ws la rge packets to be multi link-encapsulated and fragmented into smaller packets to satisfy the de lay requirements of real-time v oice traf fic; small real-ti[...]

  • Page 8

    Configure IP Networks for Real-Time Voice Traffic VC-20 Voice, Video, and Home Applications Confi guration Guide For more information about Mu ltilink PPP , refer to the “Configuring Media-Independent PPP and Multilink PPP” ch apter in the Dial Solutions Configuration Guide . Multilink PPP Configuration Example The follo wing example def ines a[...]

  • Page 9

    Configure RTP Header Compression Configuring Voice over IP for the Cisco 3600 Series VC-21 Y ou should configure R TP header compression if the following conditions exist in your network: • Slow links • Need to save bandwidth Note R TP header compression should no t be used on links greater than 2 Mbps. Perform the follo wing tasks to configure[...]

  • Page 10

    Configure Frame Relay for Voice over IP VC-22 Voice, Video, and Home Applications Confi guration Guide Configure Custom Queuing Some QoS features, such as IP R TP reserve and custom queuing, are based on the transport protocol and the associated port number . Re al-time voice traf fic is carried on UDP ports ranging from 16384 to 16624. This number[...]

  • Page 11

    Frame Relay for Voice over IP C onfiguratio n Example Configuring Voice over IP for the Cisco 3600 Series VC-23 Note Lowering the MTU size af fect s data th roughput speed. • CIR equal to line rate—Make sure that the data rate does not exceed the CIR. This is accomplished through generic traff ic shaping. — Use IP Precedence to prioritize v o[...]

  • Page 12

    Configure Number Exp ansion VC-24 Voice, Video, and Home Applications Confi guration Guide • Fair -queuing is enabled. • IP R TP header compression is enabled. The subinterface has been conf igured as follo ws: • MTU size is inherited from the main interface. • IP address for the subi nterf ace is specified. • Bandwidth is set to 64 kbps.[...]

  • Page 13

    Configure Number Expa nsion Configuring Voice over IP for the Cisco 3600 Series VC-25 Figure 5 Sample V o ice over IP Netw ork T able 5 sho ws the number expansion table for this scenario. T able 5 Sample Number Ex pansion T able Note Y ou can use the period symbol (.) to represent variables (such as extension numbers) in a telephone number . The i[...]

  • Page 14

    Configure Dial Peers VC-26 Voice, Video, and Home Applications Confi guration Guide Configure Dial P eers The key point to understanding ho w V oice ov er IP f unctions is to understand dial peers. Each dial peer def ines the characteristics as sociated with a call leg, as sh o wn in Figure 6 and Figure 7. A call leg is a discrete segment of a call[...]

  • Page 15

    Inbound versus Outb ound Dial Peers Configuring Voice over IP for the Cisco 3600 Series VC-27 PO TS peers associate a telephone number with a par ticul ar voice port so that incoming calls for that telephone number can be recei ved and outgoing calls can be pl aced. V oIP peers point to specific devices (b y associating destinatio n telephone numbe[...]

  • Page 16

    Configure Dial Peers VC-28 Voice, Video, and Home Applications Confi guration Guide Figure 9 Outgoing Calls from the P erspective of PO TS Dial P eer 2 T o complete the end-to-end call between dial peer 1 and dial peer 4 as illustrated in Fig ure 9, enter the following commands on router 10.1.1.2: dial-peer voice 4 pots destination-pattern 1310555.[...]

  • Page 17

    Configure POTS Peers Configuring Voice over IP for the Cisco 3600 Series VC-29 Configure PO TS P eers Once again, PO TS peers enable incoming calls to be recei ved b y a particular telephony de vice. T o configure a PO TS peer, you need to uniquely id entify the peer (by assigning it a uniqu e tag number), define its telephone number(s), and associ[...]

  • Page 18

    Configure Dial Peers VC-30 Voice, Video, and Home Applications Confi guration Guide Figure 10 Incoming and Outgo ing PO TS Call Legs Unless otherwise conf igured, when a call arriv es on the access server , the server presents a dial tone to the caller and collects digits until it can id entify th e destination dial peer . After the dial peer has b[...]

  • Page 19

    Configure VoIP Peers Configuring Voice over IP for the Cisco 3600 Series VC-31 T o conf igure DID for a particular PO TS dial peer , use the following commands beginning in global configuration mode: Note Direct inward dial is conf igured for the calling POTS dial peer . For additional PO TS dial-peer configuration op tions, refer to the “V oice-[...]

  • Page 20

    Optimize Dial Peer and Netw ork Inte rface Configura tions VC-32 Voice, Video, and Home Applications Confi guration Guide V alidation Tips Y ou can check the validity of your dial-peer configuration b y performing the fol lo wing tasks: • If you hav e relativ ely few dial peers conf igured, you can use the show dial-peer voice command to veri fy [...]

  • Page 21

    Configure RSVP for Dial Peers Configuring Voice over IP for the Cisco 3600 Series VC-33 T o gi ve real-time v oice traff ic precedence over othe r IP network traf fic, use the following commands, beginning in global configuration mode: In IP Precedence, the numbers 1 through 5 identify cl asses for IP flows; the numbers 6 through 7 are used for net[...]

  • Page 22

    Optimize Dial Peer and Netw ork Inte rface Configura tions VC-34 Voice, Video, and Home Applications Confi guration Guide T o generate an SNMP trap message if the reserv ed QoS is less than th e conf igured v alue for a selected V oIP peer , use the following commands, beginning in global configuration mode: Note RSVP reserv ations are only one-way[...]

  • Page 23

    Configure Voice over IP using a Trunk Connection Configuring Voice over IP for the Cisco 3600 Series VC-35 Configure V AD f or a V oIP Dial P eer T o disable the transmission of si lence pack ets for a selected V oIP peer , use the following comma nds beginning in global configuration mode: The default for the vad command is enabled; normal ly the [...]

  • Page 24

    Configure Voice over IP using a Trunk Connection VC-36 Voice, Video, and Home Applications Confi guration Guide The routers on both sides of the V o ice over IP connection must be configured for trunk connections. For the scenario described in Figure 11, configure Router A to support trunk connecti ons as follows: configure terminal voice-port 1/0/[...]

  • Page 25

    Configure Voic e over IP for Microso ft NetMeeting Configuring Voice over IP for the Cisco 3600 Series VC-37 Configure a T r unk Connection T o conf igure virtual trunk connections in a V oIP network, use the following commands beginning in global configuration mode: Note This configuration must be performed on both end routers for the trunk connec[...]

  • Page 26

    Voice over IP Conf iguration Exampl es VC-38 Voice, Video, and Home Applications Confi guration Guide Configure Microsoft NetMeeting f or V oice ov er IP T o conf igure NetMeeting to w ork with V o ice over IP , complete the following steps: Step 1 From the T ools menu in the Ne tMeeting application, select Options . NetMeeting will display the Opt[...]

  • Page 27

    FXS-to-FXS Connect ion Using RSVP Configuring Voice over IP for the Cisco 3600 Series VC-39 R12-e establish the W AN connection between the two off ices. Because one PO TS telephony de vice is connected to Router RLB-2, it has also been configured for only one PO TS peer and one V oIP peer . Note In this example, only the calling end (Router RLB-1)[...]

  • Page 28

    Voice over IP Conf iguration Exampl es VC-40 Voice, Video, and Home Applications Confi guration Guide clockrate 64000 router igrp 888 network 10.0.0.0 network 20.0.0.0 network 40.0.0.0[...]

  • Page 29

    FXS-to-FXS Connect ion Using RSVP Configuring Voice over IP for the Cisco 3600 Series VC-41 Configuration f or Router RLB-w hostname rlb-w ! Configure serial interface 1/0 interface Serial1/0 ip address 10.0.0.2 255.0.0.0 ! Configure RTP header compression ip rtp header-compression ip rtp compression-connections 25 ! Enable RSVP on this interface i[...]

  • Page 30

    Voice over IP Conf iguration Exampl es VC-42 Voice, Video, and Home Applications Confi guration Guide ! Configure IGRP router igrp 888 network 10.0.0.0 network 20.0.0.0 network 40.0.0.0 Configuration f or Router RLB-2 hostname r1b-2 ! Create pots dial peer 2 dial-peer voice 2 pots ! Define its associated telephone number and voice port destination-[...]

  • Page 31

    Linking PBX Users with E&M Trunk Lines Configuring Voice over IP for the Cisco 3600 Series VC-43 Linking PBX Users with E&M T r unk Lines The following e xample shows ho w to configure V oice over IP to link PBX users with E&M trunk lines. In this ex ample, a company wants to connect two of fices: one in San Jose, California and the oth[...]

  • Page 32

    Voice over IP Conf iguration Exampl es VC-44 Voice, Video, and Home Applications Confi guration Guide voice-port 1/0/1 signal immediate operation 4-wire type 2 !Configure the serial interface interface serial 0/0 description serial interface type dce (provides clock) clock rate 2000000 ip address 172.16.1.123 no shutdown Configuration f or Router S[...]

  • Page 33

    PSTN Gateway Access Using FXO Connection Configuring Voice over IP for the Cisco 3600 Series VC-45 PSTN Gate wa y Access Using FXO Connection The following e xample shows ho w to configure V oice over IP to link users with the PSTN gatew ay using an FXO connecti on. In this example, users connected to Router SJ in San Jose, Ca lifornia can reach PS[...]

  • Page 34

    Voice over IP Conf iguration Exampl es VC-46 Voice, Video, and Home Applications Confi guration Guide Configuration f or Router SLC ! Configure pots dial peer 1 dial-peer voice 1 pots destination-pattern 9........... port 1/0/0 ! Configure voip dial peer 2 dial-peer voice 2 voip destination-pattern +14085554000 session target ipv4:172.16.1.123 ! Co[...]

  • Page 35

    PSTN Gateway Access Using FXO Connection (PLAR Mode) Configuring Voice over IP for the Cisco 3600 Series VC-47 Configuration f or Router SJ ! Configure pots dial peer 1 dial-peer voice 1 pots destination-pattern +14085554000 port 1/0/0 ! Configure voip dial peer 2 dial-peer voice 2 voip destination-pattern 9........... session target ipv4:172.16.65[...]

  • Page 36

    Voice over IP Conf iguration Exampl es VC-48 Voice, Video, and Home Applications Confi guration Guide[...]