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Service requirements/definition of service types Definition of service requirements (delay, jitter, and so on) Definition of framework for VoMPLS operation Single MPLS domain versus multiple MPLS domains Interworking with PSTN/ATM network domains Definition of LSP usage Requirements to achieve voice service requirements Predictable resource usage and GoS
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Call, bearer, and device control protocol requirements Media gateway control (MEGACO), media gateway control protocol (MGCP), and Session Description Protocol (SDP) Session Initiation Protocol (SIP) H323 Q1901 LDP, CR-LDP, and RSVP-TE Specification of encapsulation mechanisms Advanced Intelligent Network (AIN) features
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Figure 5-5 depicts interworking elements at a high level of generalization Table 5-2 describes the interworking layers that have to be considered The choice of carriage approach also depends on the intended application If VoMPLS is utilized end to end (as would be the case in Phase 3 of the transition discussed in 1), a dynamic addressing mechanism is needed If VoMPLS is used for trunking applications (as is the case in Phase 1 of the transition shown in 1), the address is implicitly understood when the LSPs are set up by administrative action (This is similar to setting up permanent virtual circuits [PVCs] in ATM; the devices in such a situation do not require an E164 address) Figures 5-6 and 5-7 show an intranet application of VoP Figure 5-6 shows a VoIP application and the
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Figure 5-5 Interworking elements
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Other Services
Internet PSTN RAS/ Gateway STP Switch SCP
Gateway RAS/ Gateway STP Switch
Switch
Switch
Motivations, Drivers, Approaches, and Advantages of VoMPLS
Table 5-2 Interworking Layers and Supporting Elements
Service layer
Functionality Authentication, billing, rating, IN functions, routing, directories, settlement, and user profiles Terminal registration, domain location, call routing, charging, and address resolution
Protocols TCAP, INAP, RADIUS, OSP, and LDAP
Network Elements IN-SCP, IP-SCP, AAA, HLR, and CAMEL
Service control layer
H255RAS and Annex G
Gatekeepers, media gateway controllers, SIP registration servers, and boarder elements Gatekeepers, media gateway controllers, signaling gateways, boarder element
Call control layer
Signaling translation, call control, interdomain communication, supplementary services, signaling privacy, SCN signaling termination, packet signaling Media flows, bearer admission control, bearer control, and media/ bearer negotiation Codec translation, QoS reservation, circuitnetwork media termination, packet-network media termination, and media processing
H2250, H225RAS, SIP, SS7, MGCP/ MEGACO/ H248
Bearer control layer
MGCP/MEGACO/ H248, RTCP, and RTSP
Media gateway controllers and media gateways
Media control layer
RTP, G711, G729, Media gateways G723, RSVP, MPLS, T120, and T38
Source: Trillium
kinds of PDUs that will flow in such a network; Figure 5-7 does the same for a VoMPLS design As noted, an area that will require attention is MPLS/IP header compression If voice frames are transmitted using the normal RTP/UDP/IP stack, then for each voice frame6 G729A voice frame RTP header UDP header IP header Total 20 bytes 12 bytes 8 bytes 20 bytes 60 bytes a transmission efficiency of 33 percent
Figure 5-6 H323-based VoIP intranet environment
H323 Terminal Non-Guaranteed QoS LAN (Ethernet) H323 Gatekeeper H323 Gateway H323 Terminal
G7231 RTP UDP IP MAC
Five
H323 Location A R
H323 MCU
PSTN/ N-ISDN
PDU (example) (data plane)
G7231 RTP UDP IP PPP SONET
Location B H323 Terminal R H323 Terminal
Speech Terminal
H320 Terminal
R H323 Terminal
H323 Terminal Location C
Instead of being able to transmit 20 compressed streams in place of 1 pulse code modulation (PCM) stream, we can now only transmit 7 If several voice frames are packed into one RTP packet, transmission efficiency will be improved dramatically This will, however, cause an increase in delay because the RTP packet cannot be transmitted until its entire payload has been assembled If multiple VoIP streams are being sent from one gateway to another, it is possible to put frames from several different streams into the same RTP packet This brings the advantages of improved transmission efficiency with a minimal increase in delay and only a small increase in complexity Within a dedicated VoIP network, much of the information carried in the RTP/UDP/IP header is redundant; hence, it is possible to compress this The degree to which this is possible will be limited because at least the IP header is required to route packets through the network unless MPLS or some similar tag or label-switching protocol is used MPLS maps an IP address onto a label that can be used by label-switched routers (LSRs) to efficiently transport network traffic This approach has the advantage that traffic can be aggregated into streams with common QoS
Motivations, Drivers, Approaches, and Advantages of VoMPLS
H323 Location A LSR
G7231 RTP UDP IP MAC
Figure 5-7 H323-based VoMPLS intranet environment
H323 Terminal Non-Guaranteed QoS LAN (Ethernet) H323 Gatekeeper H323 Gateway H323 Terminal
H323 MCU
PSTN/ N-ISDN
PDU (example) (data plane)
G7231 RTP UDP IP/null MPLS PPP SONET
Location B H323 Terminal LSR H323 Terminal
MPLS
Speech Terminal
H320 Terminal
LSR H323 Terminal
H323 Terminal Location C
requirements and a common destination, and potentially can be used for header compression within the network The advantage of using MPLS may derive more from lower infrastructure costs and improved QoS characteristics than from bandwidth efficiency Table 5-3 depicts some of the issues and potential solutions that affect the transport side of a VoMPLS solution Hopefully, VoMPLS will build on the experience of VoIP in terms of issues such as echo, prioritization/queue management, and so on The following lists some typical service-related capabilities that are required beyond transport, just to come out with a voice service that is on the par with existing services As indicated elsewhere, a VoP needs compelling new services to promote its deployment:
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