System and method for routing voice over ip calls

Details System and method for routing voice over ip calls System and method for routing voice over ip calls

H - Electricity

04

L

H04L 29/06 (2006.01) H04L 12/28 (2006.01) H04L 12/56 (2006.01) H04M 7/00 (2006.01) H04Q 3/00 (2006.01)

Patent

CA 2466191

An SIP server (18) in an IP-based infrastructure supporting wireless telephones determines whether, based on the destination address in a call request, the call is an intrasystem call or an intersystem call. For intrasystem calls the SIP server routes VOIP packets directly between the originating and destination devices. For intersystem calls, however, and in particular encrypted calls, instead of routing the VOIP packets through the public Internet, the SIP server instantiates a circuit-switched call using a local modem bank (22) connected to the PSTN (24). In this way, quality of service assurance is obtained and latency reduced.

Un serveur SIP dans une infrastructure bas~e sur IP supportant des t~l~phones sans fil d~termine si, sur la base de l'adresse de destination dans une demande d'appel, l'appel est un appel au sein d'un syst­me ou entre syst­mes. Pour les appels au sein d'un syst­me, le serveur SIP achemine les paquets voix sur IP directement entre les dispositifs d'origine et de destination. Toutefois, pour les appels entre syst­mes, et en particulier pour les appels crypt~s, au lieu d'acheminer les paquets voix sur IP par l'Internet public, le serveur SIP ~tablit un appel par commutation de circuit ~ l'aide d'une batterie de modems locale connect~e au RTPC. De cette mani­re, la qualit~ de service est assur~e et le temps de latence r~duit.

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