Specifications

Administrator’s Guide for SIP-T2xP IP Phones
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server. IP phones themselves do not have memory to store the recording, what they
can do is to trigger the recording and indicate the recording status.
Normally, there are 2 main methods to trigger a recording on a certain server. We call
them record and URL record. Record is for the IP phone to send the server a SIP INFO
message containing a specific header. URL record is for the IP phone to send an HTTP
GET message containing a specific URL to the server. The server processes these
messages and decides to start or stop a recording.
Record
When a user presses a record key for the first time during a call, the IP phone sends a SIP
INFO message to the server with the specific header “Record: on”, and then the
recording starts.
Example of a SIP INFO message:
Via: SIP/2.0/UDP 10.1.4.148:5063;branch=z9hG4bK1139980711
From: "827" <sip:827@192.168.1.199>;tag=2066430997
To:<sip:614@192.168.1.199>;tag=371745247
Call-ID: 1895019940@10.1.4.148
CSeq: 2 INFO
Contact: <sip:827@10.1.4.148:5063>
Max-Forwards: 70
User-Agent: Yealink SIP-T28P 2.71.0.140
Record: on
Content-Length: 0
When the user presses the record key for the second time, the IP phone sends a SIP
INFO message to the server with the specific header “Record: off”, and then the
recording stops.
Example of a SIP INFO message:
Via: SIP/2.0/UDP 10.1.4.148:5063;branch=z9hG4bK1619489730
From: "827" <sip:827@192.168.1.199>;tag=1831694891
To:<sip:614@192.168.1.199>;tag=2228378244
Call-ID: 1051886688@10.1.4.148
CSeq: 3 INFO
Contact: <sip:827@10.1.4.148:5063>
Max-Forwards: 70
User-Agent: Yealink SIP-T28P 2.71.0.140
Record: off
Content-Length: 0
URL Record
When a user presses a URL record key for the first time during a call, the IP phone sends
an HTTP GET message to the server.