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

[Atahualpa alonso]

Thanks for the discussion has been for me very clear, I was thinking that was necesary to have anothers entities like proxy etc.. to have a comunication between to sip phones
  now I see that it's posible face to face sip -phones comunications.
  Best regards
  Alonso
Jason Nesheim <jnesheim at telepacific.com> wrote:
  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 can’t 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
  
    
---------------------------------
    Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. <http://us.rd.yahoo.com/evt=51733/*http:/mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ%20> 

 This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you.
  
---------------------------------
  _______________________________________________
This is the SIP Forum discussion mailing list
TO UNSUBSCRIBE, or edit your delivery options, please visit http://sipforum.org/mailman/listinfo/discussion
Post to the list at discussion at sipforum.org





-- 
Jason Nesheim, Network Engineer
Telepacific Communications
Office: 702-405-3571
Mobile: 702-885-0815


       
---------------------------------
Looking for last minute shopping deals?  Find them fast with Yahoo! Search.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20080303/00d32e25/attachment-0002.html>