Думаю нет, потому что по очевидной третьей сверху ссылке - ответ:
14/09/2007 - Firmware: 020810000000 / 041.00 EPROM: 103 (alias v81)
* Fixed CLI length issue, now truncates instead of displaying 'Unknown'
* R-button now works in SIP mode (You need to enable this in advanced settings, Telephony / Advanced Settings page to includes Hook-Flash call transfer). See also this thread on call transfer. User report: When pressed Asterisk 1.4.13 reports this error and nothing happens: "WARNING[905]: chan_sip.c:2773 sip_indicate: Don't know how to indicate condition 9"
http://www.voip-info.org/wiki/view/Siem ... set+S450IP