Administrator’s Guide for SIP-T46G IP Phone140Call recording enables users to record calls. It depends on support from a SIP server.When the user presses the call record key, the IP phone sends a record request to theserver. The IP phones themselves do not have memory to store the recording, what theycan 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 callthem record and URL record. Record is for the IP phone to send the server a SIP INFOmessage containing a specific header. URL record is for the IP phone to send an HTTPURL to the server. The server processes these messages and decides to start or stop arecording.RecordWhen a user presses a record key for the first time during a call, the IP phone sends aSIP INFO message to the server with the specific header ―Record: on‖, and then therecording starts.The example of a SIP INFO message for reference:Via: SIP/2.0/UDP 10.1.4.148:5063;branch=z9hG4bK1139980711From: "827" ;tag=2066430997To:;tag=371745247Call-ID: 1895019940@10.1.4.148CSeq: 2 INFOContact: Max-Forwards: 70User-Agent: Yealink SIP-T46G 28.71.0.10Record: onContent-Length: 0When the user presses the record key for the second time, the IP phone sends a SIPINFO message to the server with the specific header ―Record: off‖, and then therecording stops.The example of a SIP INFO message for reference:Via: SIP/2.0/UDP 10.1.4.148:5063;branch=z9hG4bK1619489730From: "827" ;tag=1831694891To:;tag=2228378244Call-ID: 1051886688@10.1.4.148CSeq: 3 INFOContact: Max-Forwards: 70User-Agent: Yealink SIP-T46G 28.71.0.10Record: offVoIPon www.voipon.co.uk sales@voipon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
