SIP User Agent(sipua) - software installed in VoIP-GSM gateways ELGATO. Now this software supports SIP via rfc3261, rfc3262. Back compatibility (for incoming requests) via protocol SIP rfc2543.
Ссылки:
http://en.wikipedia.org/wiki/Session_Initiation_Protocol
http://tools.ietf.org/html/rfc3261
http://tools.ietf.org/html/rfc3262
http://tools.ietf.org/html/rfc2543

SIP User Agent(sipua) - software installed in VoIP-GSM gateways ELGATO. Now this software supports SIP via rfc3261, rfc3262. Back compatibility (for incoming requests) via protocol SIP rfc2543.

Links:

Manufacturer: ELGATO Communications (Ukraine)

Contacts in Ukraine

+380(67)527-4171 (mob/telegram)
+380(56)719-9030 (office)

Local landlines

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+44(203)769-1858

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+1(312)940-6939

www.elgato.com.ua

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