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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.
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.
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 .
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,.
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.
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.
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 pa.
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 .
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.
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 .
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.
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.
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 (.
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.
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.
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.
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.
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 .
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 .
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.
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, begi.
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 .
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 .
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.
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,.
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 .
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 .
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.
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.
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.
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.
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.
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.
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.
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.
Voice over IP Conf iguration Exampl es VC-48 Voice, Video, and Home Applications Confi guration Guide.
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