[SIPForum-discussion] terminal sip to sip terminal without use proxy

[Jason Nesheim]

Actually, it is entirely possible to do this with a standard SIP UAC/UAS
setup, although various SIP phone implementations may have vendor specific
limitations in this regard. For an example of a phone that does support URL
dialing, take a look at Polycom SoundPoint SIP phones.

SIP Phones can usually query DNS servers.  This functionality would be a
requirement for any device that would register to a SIP Registrar by FQDN.
Registration is not necessarily a requirement.  It is entirely possible for
two endpoints to have a direct SIP dialog with each other.  Registration is
usually used to inform the SIP Proxy, SBC, or B2BUA of the location of SIP
endpoints, and also in some cases to establish what source IP and port are
allowed to send further SIP messages (such as in the case of a SBC
protecting a SIP registrar).  For an ITSP scenario registration would
usually be a requirement, but in many cases, such as a SIP media gateway to
SIP Proxy/B2BUA setup, no registration would be involved.

On 3/2/08 8:34 PM, "Subbarao, PraveenKumar"
<praveenkumar.subbarao at logica.com> wrote:

> Hi,
>  
> I think it is not possible to have a direct call establishment between two SIP
> phones, as I know. The doubts what I have on this is :
>  
> * Can SIP Phone can¹t do DNS Look up
> * Can SIP phone has the functionality of Registrar ( I mean, how does it do
> Registrations?) 
> * If the answer is NO for any one of the above questions, then the question is
> answered 
> * I think SIP phone is merely a UAC
>  
> Regards,
> Praveen
>  
> 
> 
> From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org]
> On Behalf Of Atahualpa alonso
> Sent: Sunday, March 02, 2008 11:59 PM
> To: discussion at sipforum.org
> Subject: [SIPForum-discussion] terminal sip to sip terminal without use proxy
>  
> 
> Hi:
> 
> does everybody know if is it posible to stablished a SIP phone call with
> another Sip phone directly ,I mean without use any server proxy, locator etc,
> just the phones
> 
> if is possiblethere is some recommendations????
> 
> best regards
> 
> Alonso
>   
> 
> 
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