@alexyosifov approved this pull request.

Added some comments

In src/modules/ims_ipsec_pcscf/cmd.c:

> @@ -846,11 +846,20 @@ int ipsec_forward(struct sip_msg* m, udomain_t* d, int _cflags)
         // for Reply get the dest proto from the received request
         dst_proto = req->rcv.proto;
 
-        // for Reply and TCP sends from P-CSCF server port, for Reply and UDP sends from P-CSCF client port
-        src_port = dst_proto == PROTO_TCP ? s->port_ps : s->port_pc;
+        // Check send socket

Why you have to check "send socket" here? You perform the check with zero src_port and dst_proto.
The "send socket" always is present. If you scroll down at row 877 there is the same check and if "send socket" is not present the function returns an error.
I do not see value from this change and I am not sure this will work properly.
Correct me if I am wrong.

In src/modules/ims_ipsec_pcscf/ipsec.c:

>      strcpy(l_enc_algo->alg_name,"cipher_null");
+    if (strncasecmp(r_ealg.s,"aes-cbc",r_ealg.len) == 0) {

Is it a good idea cipher algorithm to be optional? Just add a new value in _cflags parameter in int ipsec_create(struct sip_msg* m, udomain_t* d, int _cflags) method.

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