Fourth International Conference onDigital Telecommunications, 2009. ICDT '09. 20-25 July 2009

A Comparative Study of VoIP Standards with Asterisk

Advisor : Lian-Jou TsaiStudent : PEI-SIOU HUANGDate : 2013/3/07

最近研究方向AsteriskVoIP Standards

OutlineAbstractINTRODUCTIONVOIP PROTOCOLS UNDER ANALYSISDESCRIPTION OF THE TESTBEDANALYSIS OF THE EXPERIMENTAL

RESULTSCONCLUSIONS

AbstractSince the apparition of Voice over IP

(VoIP), many standards (mainly signaling protocols and codecs) have arisen with the aim of enabling voice calls through data networks.

INTRODUCTIONVoice over Internet Protocol (VoIP) has

become a very popular technology. extend these analysis to compare the

performance of different signaling protocols and codecs for voice calls in an actual VoIP testbed based on Asterisk

Protocols :H.323, SIP, IAX

H.323 and SIP for signaling and RTP for the transport.

IAX is a new concept in VoIP as it combines both functions in the same protocol. (signaling and multimedia)

VOIP PROTOCOLS UNDER ANALYSIS(1)

VOIP PROTOCOLS UNDER ANALYSIS(2)

DESCRIPTION OF THE TESTBED(1)

Figure 1. Test bed under study

DESCRIPTION OF THE TESTBED(2)

Figure 2. Connection diagram

DESCRIPTION OF THE TESTBED(3)

ANALYSIS OF THE EXPERIMENTAL RESULTS(1)ProcessorAs it was previously remarked, when no transcoding is performed, the main processor load is the routing of the calls.

ANALYSIS OF THE EXPERIMENTAL RESULTS(2)Memory UtilizationAll results are in the range of 33 MB to 42 MB

ANALYSIS OF THE EXPERIMENTAL RESULTS(3)

Bandwidth Consumptionone for the reception traffic and one for the transmission traffic. Both of them should be equal

ANALYSIS OF THE EXPERIMENTAL RESULTS(4)

show the benefits of trunking

ANALYSIS OF THE EXPERIMENTAL RESULTS(5)

CONCLUSIONS(1)

CONCLUSIONS(2)For g.711 (A law), g.726 and gsm: 54 bytes/20 ms = 2700 bytes/s = 21,6 kbps.

For lpc10 will be: 54 bytes/22,5 ms = 2400 bytes/s = 19,2 kbps.

For g.711: 54 bytes of headers + 160 of data bytes =214bytes/frame (25 % corresponding to headers).

For g.726: 54 bytes headers + 80 data bytes = 134bytes/frame (40 % corresponding to headers).

For gsm: 54 bytes headers + 33 data bytes = 87bytes/frame (62 % corresponding to headers).

For lpc10: 54 bytes headers + 7 data bytes = 61bytes/frame (88 %

corresponding to headers).

CONCLUSIONS(3)46bytes/20 ms=2300 bytes/s = 18,4 kbps, While for lpc10 will be: 46 bytes/22,5 ms=2044 bytes/s=16,3 kbps.

For g.711 (A law): 46 bytes headers + 160 databytes=206 bytes/frame (22 % corresponding toheaders).

For g.726: 46 bytes headers + 80 data bytes = 126

bytes/frame (36 % corresponding to headers).

For gsm: 46 bytes headers + 33 data bytes = 79

bytes/frame (58 % corresponding to headers).

For lpc10: 46 bytes headers + 7 data bytes = 53

bytes/frame (87 % corresponding to headers).

CONCLUSIONS(4) For g.711 (A law): 188 bytes of IAX headers + 168bytes (4 packets) of UDP/IP/Ethernet headers +

4800 data bytes (30 calls x 160 bytes/frame) = 5156bytes (7 % corresponding to headers).

g.726: 188 bytes IAX headers + 84 bytes (2 packets)headers of UDP/IP/Ethernet headers + 2400 data bytes (30 calls x 80 bytes/frame)= 2672 bytes (10 %corresponding to headers).

gsm: 188 bytes IAX headers + 42 bytes (1 packet) of headers of UDP/IP/Ethernet headers + 990 data bytes (30 calls x 33 bytes/frame)= 1220 bytes (19 % corresponding to headers).

lpc10: 188 bytes IAX headers + 42 bytes (1 packet) of headers of UDP/IP/Ethernet headers + 210 data bytes (30 calls x 7 bytes/frame)= 440 bytes (52 % corresponding to headers).

CONCLUSIONS(5)Different VoIP codecs and protocols have been compared obtaining empirical results about processor and memory utilization and bandwidth consumption.

Results show the clear benefits of employing call trunking (under IAX) as it reduces the overhead introduced by protocol headers, especially when a high number of simultaneous calls are multiplexed.

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