[SIPForum-discussion] sip uri format with the +sign

[Aniella Juverdeanu]

It is if you are using IP peering  - prefix is not used for calling nationally or internationally (just CC).
 SIP-ISUP-SIP mapping - RFC 3398 - E.164 format.

The E.164 format allows the SIP node to classify the called party as international or national when comparing the CC (country code) with the local configured one. For example in your number  +1.. the 1 after the +  is North America CC. If the SIP node has configured its CC as 1, it will know that the called party is a national number. If the called party was for example +44..., then the SIP node cannot match with its local CC therefore the called party is international and can route the call accordingly.

Aniella

From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Nikos Leontsinis
Sent: December 31, 2011 8:13 AM
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] sip uri format with the +sign

I see that there are many carriers having adopted the sip uri with the + in front
example:
sip:+1-212-555-1212:1234 at gateway.com<mailto:sip%3A%2B1-212-555-1212%3A1234 at gateway.com>;user=phone
This is not mandatory looking at the rfc 3261 is there any motivation behind this decision?

/nikos
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20120104/df26bde7/attachment-0002.html>