Yes, CONTACT header field is mandatory for the SIP INVITE request. Cheers, Aman preet Singh
On Thu, Feb 22, 2018 at 12:57 AM, Zuñiga, Guillermo < guillermo.zun...@cwpanama.com> wrote: > Hi fellows, > > I would you can help me to know and be clear about the following questions: > > Is the CONTACT header mandatory that always have to be present in the > INVITE? > I am asking that for the case that imagine that Endpoint after is > Registered in a Registrar Server, send me the following header info. > > FROM uri-user =anonymous@domain/ip > TO uri-user=called(uri-user)@domain/ip > > CONTACT = could be anonymous@domain/ip or should be original > uri-user@domain/ip ?? if you can help me to identify this in the RFC or > give some tips more where I can search more information, will be great. > > > According with the RFC 3261, > 8.1.1.8 Contact > > > The Contact header field provides a SIP or SIPS URI that can be used > to contact that specific instance of the UA for subsequent requests. > The Contact header field MUST be present and contain exactly one SIP > or SIPS URI in any request that can result in the establishment of a > dialog. For the methods defined in this specification, that includes > only the INVITE request. For these requests, the scope of the > Contact is global. That is, the Contact header field value contains > the URI at which the UA would like to receive requests, and this URI > MUST be valid even if used in subsequent requests outside of any > dialogs. > > If the Request-URI or top Route header field value contains a SIPS > URI, the Contact header field MUST contain a SIPS URI as well. > > For further information on the Contact header field, see Section > 20.10. > > > Regards and thanks for all your time. > I really appreciate a lot your time. > > Thanks, > Guillermo > > > > Guillermo Zuniga > Especialista de Soporte Técnico > Gerencia de Soporte Técnico > > Tel: +507 263-6671 > Cel: +507 6670-0481 > Fax: +507 265-3295 > Email: guillermo.zun...@cwpanama.com > > [cid:image3f4341.JPG@d191b510.4e907fe0]<http://> > > <http://www.cwpanama.com> > > <http://www.cwpanama.com> > > <http://play.google.com/store/apps/details?id=com.croem.web.cwp> > > <http://www.facebook.com/masmovilpanama> > > <http://www.cwpanama.com> > > <http://bit.ly/MasMovil> > > <http://www.facebook.com/masmovilpanama> > > <http://www.facebook.com/masmovilpanama> > > [cid:image447e4b.JPG@010140db.4385dd6c]<http://> > > > > El contenido de este correo es confidencial y puede ser objeto de acciones > legales. Es dirigido solo para el o los destinatarios(s) nombrados > anteriormente. Si no es mencionado como destinatario, no debe leer, copiar, > revelar, reenviar o utilizar el contenido de este mensaje. Si ha recibido > este correo por error, por favor notifique al remitente y proceda a borrar > el mensaje y archivos adjuntos sin conservar copias. > > The information contained in this e-mail is confidential and may also be > subject to legal privilege. It is intended only for the recipient(s) named > above. If you are not named as a recipient, you must not read, copy, > disclose, forward or otherwise use the information contained in this > email. If you have received this e-mail in error, please notify the sender > immediately by reply e-mail and delete the message and any attachments > without retaining any copies. > > _______________________________________________ > Sip-implementors mailing list > Sip-implementors@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors > > _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
