quick look at the path header, I did test the first 5.x version, with the same result.
I will probably start to debug, looking at this, it seems like the escaping may be expected :
``` static int prepend_path(sip_msg_t* _m, str *user, path_param_t param, str *add_params) { struct lump *l; char *prefix, *suffix, *cp, *dp; const char *proto_str; int prefix_len, suffix_len; struct hdr_field *hf;
/* maximum possible length of suffix */ suffix_len = sizeof(";lr;r2=on;received=sip::12345%3Btransport%3Dsctp;ob;>\r\n") + IP_ADDR_MAX_STR_SIZE + 2 + (add_params ? add_params->len : 0) + 1; ```
I will try to dig it further shortly