Iyo yekushandisa yakaziviswa munguva pfupi yapfuura D-Modemu izvo inomira kunze kwekushandisa modem software kuronga kufambiswa kwedata pamanetiweki VoIP yakavakirwa paSIP protocol.
D-Modem inokutendera iwe kuti ugadzire chiteshi chekutaurirana kuburikidza neVoIP nekuenzanisa nenzira iyo yechinyakare yekufona-up modem inobvumira kufambiswa kwedata panharembozha.
Nzvimbo dzekushandisa mapurojekiti dzinosanganisira kubatanidza kune iripo dial-up network pasina kushandisa imwe magumo enharembozha, kuronga nzira dzekutaurirana dzakavanda, uye kuita bvunzo dzekuchengetedza masisitimu anogona kuwanikwa kuburikidza nenharembozha. Iyo kodhi yeprojekiti yakanyorwa muC uye inogoverwa pasi peGPLv2 rezinesi.
Chinyakare "controller-based" modem anowanzo shandisa microcontroller uye DSP kubata ese maficha ekutaurirana modem pane mudziyo pachawo. Gare gare, inonzi "Winmodems" yakaunzwa iyo yakagonesa munda-inorongwa DSPs uye yakafambisa mutongi uye mamwe mabasa kune software inoshanda paPC inotambira. Izvi zvakateverwa ne "pure software" modem iyo yakaunzawo DSP mashandiro kune muenzi. Iyo yenyama hardware yeaya manyoro modem yaingoshandiswa kubatanidza kune nharembozha, uye kuseta kwese kwakaitwa musoftware.
D-Modemu inotsiva iyo yenyama hardware yesoftmodem ine SIP stack. Panzvimbo yekupfuudza odhiyo kuenda uye kubva kuDSP software pamusoro peanalog runhare mutsara, iyo odhiyo inofamba nepakati peRTP (kana SRTP) midhiya midhiya yeSIP VoIP kufona.
SIP protocol rutsigiro runoitwa kuburikidza nePJSIP yekutaurirana raibhurari uye slmodem mutyairi zvikamu, pakutanga akapihwa Smart Link software modem, anoshandiswa kuve nechokwadi chekushanda kwemodemu.
Kusiyana nemamodemu echinyakare, anoshandisa DSP yekugadzira chiratidzo, uye modulation inoitwa ne microcontroller, software modem ine DSP chete uye mamwe mabasa ese anoitwa musoftware kudivi rekutonga.
Iyo D-Modem chirongwa inopa yakazara software modem umo DSP mashandiro inoshandiswawo mune software. Izvo zvikamu zvehardware zvinoshandiswa mumamodemu zvakatsiviwa neSIP stack uye pachinzvimbo chekushandisa DSP kutumira odhiyo pamusoro peanalogi mitsetse yekukurukurirana muD-Modem, ruzha rwunofambiswa kuburikidza nemultimedia hova dzakadai seRTP kana SRTP inoshandiswa muVoIP voice process.
Nzira dzekugadzirisa zviratidzo uye kutsigirwa kwemirairo yeAT, pamwe chete nekushandiswa kweV.32bis (14.4kbps) uye V.34 (33.6kbps) protocol, inokweretwa kubva kunze kwebhokisi slmodemd kernel driver, iyo Yakawedzerwa uye yakachekwa tichifunga nezvezvinhu zveprojekiti.
Mazhinji eiyo slmodemd kodhi ndeyemuridzi, iyo sosi kodhi haina kupihwa, BLOB dsplib.o inoshandiswa; Mutyairi wemuridzi akagadziridzwa patsva kuti amhanye zvakasiyana sechikumbiro kwete se kernel module. Kudyidzana nekunze maapplication, kugona kuchinjanisa data pamusoro petiweki socket kwaitwa. Kuti udzore slmodemd, imwe d-modem yakagadziridzwa, iyo inopa iyo yekupedzisira interface uye inosanganisira nzira dzekudzora maodhiyo hova uye manzwi ekufona zvichienderana neSIP protocol.
Mukuita, a / dev / ttySL mudziyo unogadzirwa *, kuburikidza iyo iwe unogona kushamwaridzana nemodem, kutumira AT mirairo, uye kuchinjana data, zvakafanana nekushanda kwaunoita nemodem yakajairika (somuenzaniso, unogona kushandisa pppd kugadzira IP Channel).
Kubatanidza kuSIP account kunoitwa uchishandisa SIP_LOGIN nharaunda inoshanduka. Iyo purojekiti, pakati pezvimwe zvinhu, inogona kushandiswa kubatanidza kune iripo dial-up network, mumamiriro ezvinhu apo pasina classic modem (iyo SIP kufona inogona kudzoserwa kune yakajairika nhare network).
Chekupedzisira, kana iwe uchifarira kuziva zvakawanda nezvazvo, unogona kubvunza iyo ruzivo mune inotevera chinongedzo.