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-rw-r--r--pjsip/src/pjsip-simple/presence_body.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/pjsip/src/pjsip-simple/presence_body.c b/pjsip/src/pjsip-simple/presence_body.c
index 8754735a..01b4e853 100644
--- a/pjsip/src/pjsip-simple/presence_body.c
+++ b/pjsip/src/pjsip-simple/presence_body.c
@@ -85,6 +85,8 @@ PJ_DEF(pj_status_t) pjsip_pres_create_pidf( pj_pool_t *pool,
/* Add tuple id. */
if (status->info[i].id.slen == 0) {
pj_create_unique_string(pool, &id);
+ /* xs:ID must start with letter */
+ id.ptr[0] = 'p';
} else {
id = status->info[i].id;
}