Regular Registration Mode; Single Registration For Multiple Phone Numbers Using Gin - AudioCodes E-SBC User Manual

CHAPTER 20 SIP Definitions

Regular Registration Mode

When you configure the registration mode ('Register') in the Accounts table to Regular, the device
sends REGISTER requests to the Serving IP Group. The host name (in the SIP From/To headers)
and contact user (user in From/To and Contact headers) are taken from the configured Accounts
table upon successful registration. See the example below:
REGISTER sip:xyz SIP/2.0
Via: SIP/2.0/UDP 10.33.37.78;branch=z9hG4bKac1397582418
From: <sip:ContactUser@HostName>;tag=1c1397576231
To: <sip: ContactUser@HostName >
Call-ID: 1397568957261200022256@10.33.37.78
CSeq: 1 REGISTER
Contact: <sip:ContactUser@10.33.37.78>;expires=3600
Expires: 3600
User-Agent: Sip-Gateway/7.20A.252.011
Content-Length: 0

Single Registration for Multiple Phone Numbers using GIN

When you configure the registration mode in the Accounts table to GIN , the Global Identifiable
Number (GIN) registration method is used, according to RFC 6140. The device performs GIN-
based registration of users to a SIP registrar on behalf of a SIP PBX. In effect, the PBX registers
with the service provider, just as a directly hosted SIP endpoint would register. However, because
a PBX has multiple user agents, it needs to register a contact address on behalf of each of these.
Rather than performing a separate registration procedure for each user agents, GIN registration
mode does multiple registrations using a single REGISTER transaction.
According to this mechanism, the PBX delivers to the service provider in the Contact header field of
a REGISTER request a template from which the service provider can construct contact URIs for
each of the AORs assigned to the PBX and thus, can register these contact URIs within its
location service. These registered contact URIs can then be used to deliver to the PBX inbound
requests targeted at the AORs concerned. The mechanism can be used with AORs comprising
SIP URIs based on global E.164 numbers and the service provider's domain name or sub-domain
name.
The SIP REGISTER request sent by the device for GIN registration with a SIP server provider
contains the Require and Proxy-Require headers. These headers contain the token 'gin'. The
Supported header contains the token 'path' and the URI in the Contact header contains the
parameter 'bnc' without a user part:
Contact: <sip:198.51.100.3;bnc>;
The figure below illustrates the GIN registration process:
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