http://www.hybertone.com GSM Series Voice Gateway
56
Via: SIP/2.0/UDP 192.168.2.237:5060;branch=z9hG4bK363969813
From: <sip:
8613800000000
@192.168.2.1:5060>;user=phone;tag=65248630
To: <sip:
8675588228822
@192.168.2.1>
Call-ID: [email protected]
CSeq: 2 INVITE
Contact: <sip:
8613800000000
@192.168.2.237:5060>
Max-Forwards: 30
User-Agent: HYBERTONE
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REFER, REGISTER,
MESSAGE, INFO, SUBSCRIBE
Content-Type: application/sdp
Content-Length: 226
When the user enters an SMS dial prefix, such as
999
, the above call request signaling is changed
to:
Sending Message to 192.168.2.1:5060:
INVITE sip:
999
8675588228822
@192.168.2.1:5060;transport=udp SIP/2.0
Via: SIP/2.0/UDP 192.168.2.237:5060;branch=z9hG4bK363969813
From: <sip:
8613800000000
@192.168.2.1:5060>;user=phone;tag=65248630
To: <sip:
999
8675588228822
@192.168.2.1>
Call-ID: [email protected]
CSeq: 2 INVITE
Contact: <sip:
8613800000000
@192.168.2.237:5060>