(please keep the list in CC) Hello, I see – its kind of pseudo-SIP message that is presented in the cfg in this route. And it seems that you want to access the cpim body. You already checked that the $msrp(crhop), $msrp(nexthop) and $msrp(prevop) etc.. are not working for you? It’s probably not the best way, but what about using $msrp(body) to get the body and then using a regular expression (like a transformation) on this to get the From/To? Cheers, Henning -- Henning Westerholt – https://skalatan.de/blog/ Kamailio services – https://gilawa.com<https://gilawa.com/> From: BOEINGNG &lt;lihang567890(a)126.com&gt; Sent: Wednesday, September 22, 2021 2:41 AM To: Henning Westerholt &lt;hw(a)skalatan.de&gt; Subject: Re: [SR-Users] How to get $fU and $tU from MSRP module? Yes, I logged, but only got <null> for both $fU and $tU. 2021年9月20日 下午4:03，Henning Westerholt <hw@skalatan.de<mailto:hw@skalatan.de>> 写道： Hello, I am not that familiar with the MSRP module, but have you tried to just log/access the $fU and $tU in the event_route[msrp:frame-in]? Cheers, Henning -- Henning Westerholt – https://skalatan.de/blog/ Kamailio services – https://gilawa.com<https://gilawa.com/> From: sr-users <sr-users-bounces@lists.kamailio.org<mailto:sr-users-bounces@lists.kamailio.org>> On Behalf Of BOEINGNG Sent: Friday, September 17, 2021 10:57 AM To: sr-users@lists.kamailio.org<mailto:sr-users@lists.kamailio.org> Subject: [SR-Users] How to get $fU and $tU from MSRP module? Hello! I want to get $fU and $tU from event_route[msrp:frame-in] in order to filter out MSRP messages sent by a specific sender and received by a specific receiver, I know I can get message content from $msrp(buf), the message content is like this: MSRP 7a57f552155926c0 SEND To-Path: msrp://172.18.0.14:6060/9d8da4a34dc2102959e7;tcp msrp://172.18.0.12:5060/msrp-6142fc2b-84-1;tcp msrp://172.18.0.2:34862/2a67b54ae0750b7d82aa;tcp From-Path: msrp://172.18.0.14:6060/c71ae3675e114d08216b;tcp msrp://172.18.0.12:5060/msrp-6142fc2b-83-1;tcp msrp://172.18.0.2:34858/8baea7c52ba8755322fd;tcp Byte-Range: 1-197/197 Failure-Report: yes Success-Report: yes Message-ID: c792c94039b8a969 Content-Type: message/cpim From: sip:alice@ims.mnc001.mcc001.3gppnetwork.org To: sip:bob@ims.mnc001.mcc001.3gppnetwork.org DateTime: 2021-09-16T09:23:49.339805+00:00 MIME-Version: 1.0 Content-Type: text/plain hello -------7a57f552155926c0$ I want to get alice and bob from the content below： From: sip:alice@ims.mnc001.mcc001.3gppnetwork.org To: sip:bob@ims.mnc001.mcc001.3gppnetwork.org DateTime: 2021-09-16T09:23:49.339805+00:00 someone can suggest some method. In other route like request_route we can use $fU and $tU to access them. Regrads HANG LI