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What is the modem going to be used for?<br />
Is the modem for the data or voice part?
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For terminating voice to pstn network,i need sip software gateway.
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I need a Sip gateway(software) which is compatible with LCS 2005.and which support stnadard dialup modem.I dont have ISDN BRI.Please tell me if any available. 
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I need a Sip gateway(software) which is compatible with LCS 2005.and which support stnadard dialup modem.I dont have ISDN BRI.Please tell me if any available. 

Which Sip gateway is compatible with LCS 2005

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).