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It could be that you are having QoS problems, depending how your VOIP is setup you may need to add QoS priority for the VLAN traffic that your phone is using. If it is on the same VLAN as your regular data network, you might want to separate the traffic, so they are no longer on the same network. 
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It could be that you are having QoS problems, depending how your VOIP is setup you may need to add QoS priority for the VLAN traffic that your phone is using. If it is on the same VLAN as your regular data network, you might want to separate the traffic, so they are no longer on the same network.

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What is the VoIP system and firmware version on the 51i?
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What is the VoIP system and firmware version on the 51i?

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before following other instructions i stumbled across the solution myself
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before following other instructions i stumbled across the solution myself

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Hello<br />
<br />
i have an aastra 51i voip telephone that was working fie but now cuts out after about 3 seconds on incoming calls.<br />
<br />
outbound calls seem to be working fine.<br />
<br />
i have rebooted the phone and this is still happening<br />
<br />
does anyone have any idea of what might be causing this or which settings on the phone i should be checking.<br />
<br />
other phones are working fine but they are all polycom 320 handsets. <br />
<br />
<br />
<br />

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Hello

i have an aastra 51i voip telephone that was working fie but now cuts out after about 3 seconds on incoming calls.

outbound calls seem to be working fine.

i have rebooted the phone and this is still happening

does anyone have any idea of what might be causing this or which settings on the phone i should be checking.

other phones are working fine but they are all polycom 320 handsets. 





VOIP phone cutting out (aastra 51i)

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).