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
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