diff --git a/src/modules/topoh/th_mask.c b/src/modules/topoh/th_mask.c
index 122d0935a5..895864e3c4 100644

--- a/src/modules/topoh/th_mask.c
+++ b/src/modules/topoh/th_mask.c
@@ -93,6 +93,7 @@ char* th_mask_encode(char *in, int ilen, str *prefix, int *olen)
        int  r;
        char *p;
        int  block;
+       LM_ERR("th_mask_encode C in=[%s] ilen=%i prefix=[%.*s]\n", in, ilen, prefix->len, prefix->s);
 
        *olen = (((ilen+2)/3)<<2) + ((prefix!=NULL&&prefix->len>0)?prefix->len:0);
        out = (char*)pkg_malloc((*olen+1)*sizeof(char));
@@ -121,7 +122,7 @@ char* th_mask_encode(char *in, int ilen, str *prefix, int *olen)
                *(p++) = (left>0)?_th_EB64[(block >> 6) & 0x3f]:_th_PD64[0];
                *(p++) = (left>1)?_th_EB64[block & 0x3f]:_th_PD64[0];
        }
-
+       LM_ERR("th_mask_encode D in=[%s] ilen=%i prefix=[%.*s] out=[%s], olen=%i\n", in, ilen, prefix->len, prefix->s, out, *olen);
        return out;
 }
 
@@ -135,6 +136,7 @@ char* th_mask_decode(char *in, int ilen, str *prefix, int extra, int *olen)
        int j;
        int end;
        char c;
+       LM_ERR("th_mask_decode A in=[%s] ilen=%i prefix=[%.*s] extra=%i\n", in, ilen, prefix->len, prefix->s, extra);
 
        for(n=0,i=ilen-1; in[i]==_th_PD64[0]; i--)
                n++;
@@ -178,7 +180,7 @@ char* th_mask_decode(char *in, int ilen, str *prefix, int extra, int *olen)
                for(j=0, n=16; j<3 && idx+j< *olen; j++, n-=8)
                        out[idx+j] = (char)((block >> n) & 0xff);
        }
-
+       LM_ERR("th_mask_decode B in=[%s] ilen=%i prefix=[%.*s] extra=%i out=[%s], olen=%i\n", in, ilen, prefix->len, prefix->s, extra, out, *olen);
        return out;
 }