[SIPForum-discussion] without registering a IP phone , Can we make a call?

[Stephen James]

I imagine you can enter a SIP URI in phone 1 like sip:1234512345 at 10.0.0.1 where 10.0.0.1 is phone 2 and phone 1 might send the call directly to Phone 2. This might depend on phone 1 being configured with a strict outbound proxy or not. 

Sent from my iPhone

On Nov 12, 2012, at 22:39, Rudra Kant Kanth <rudra.k1 at gmail.com> wrote:

> Hi Thomas, Mike...
> 
> For any phone (in our case, SIP phone) to speak out to an IP phone, this phone has to be registered somewhere. I am not 100% clear in drawing the picture what would happen if a VoIP gateway in placed in b/w. The job of Voice Gateway would be to provide some initial greetings or routing the call to an IP (which is our IP phone here, the IP of whose we know already); but; if someone wants to speak with the user on this phone, then, I understand that the phone has to be registered to something. This can be any gatekeeper, but, there has to be a gatekeeper which can pass the signalling onto this phone for the phone to ring and eventually answer.
> For any two phones across anywhere to speak with each other (be it a SIP or an IP phone), these phones must be registered.. Let me know if I am incorrect...
> 
> Regards,
> Rudra
> 
> 
> On Wed, Oct 10, 2012 at 8:20 PM, Thomas Trung <trungdo at patton.com> wrote:
>> Hi Michael,
>> 
>> The answer is no if you are using IP PHOne.
>> 
>> Yes, if you are using VOIP Gateway. Some of kind VoIP gateway can be support sip peer-to-peer like sip trunking so you can make the call from the phone connected to the first voip gateway to the another phone connected to the second voip gateway.
>> 
>> Regarding
>> 
>> Thomas Trung
>> 
>> From: Michael Scofield <amit.chhikara at hotmail.com>
>> Date: Tuesday, October 9, 2012 12:29 AM
>> To: "discussion at sipforum.org" <discussion at sipforum.org>
>> Subject: [SIPForum-discussion] without registering a IP phone , Can we make a call?
>> 
>> Hi All,
>> 
>> one scenerio:
>> 
>> if one phone is registered to registrar server, 2nd phone is not registered but 1st phone knows the IP address of 2nd IP Phone
>>  in that case we can make call between 2 IP Phones or not??
>> 
>> Please tell me if i am not clear.
>> 
>> Thanks in Advance.
>> 
>> 
>> Regards,
>> Michael
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