Dear support, I''m trying to encapsulate my private "application/isup" in the SIP Msg. Normally, it should like below example. It firstly addresses "Content-Type: multipart/mixed;boundary=QRLVLNKeKxWDHAuwlEkR". And then can write private "content-type" like "application/sdp". Now I can see the application/sdp is encapsulated via variable "switch_r_sdp". Is there anyway to encapsulated other customized "content-type"? Appreciate to get your reply. --------------------------------------------------------------------------------------------------------------- Here is an example of SIP message which encapsulated "applicaiton/sdp" and "application/isup". INVITE sip: 87896677@dance.com;user=phone;SIP/2.0 From: "Caller"<sip:678923001@skynetwork.com> To: <sip:87896677@dance.com>;user=phone Call-ID: QRLVLNKeKx-WDHAuwlEkR-EwhPPcTHOP@skynetwork.com Content-Type: multipart/mixed;boundary=QRLVLNKeKxWDHAuwlEkR MIME-Version: 1.0 Content-Length: 433 --QRLVLNKeKxWDHAuwlEkR Content-Type: application/sdp User-Agent: ENSR2.5.46.6-IS2-RMRG36-RG20-CPO487 Content-Length: 142 v=0 o=- 1706944438 1706944438 IN IP4 192.168.1.105 s=ENSResip t=0 0 m=audio 6793 RTP/AVP 0 a=rtpmap:0 PCMU/8000 --QRLVLNKeKxWDHAuwlEkR Content-Type: application/isup; version=ansi;base=ansi00 Content-Disposition: signal; handling=optional 01 00 60 01 0a 03 05 0b 02 c0 90 06 03 10 78 98 66 77 0a 07 83 13 76 98 32 00 0f 00 --QRLVLNKeKxWDHAuwlEkR-- Thanks ------------------- 2013-05-25