diff --git a/openbsc/src/input/ipaccess.c b/openbsc/src/input/ipaccess.c
index 323540f..2449e26 100644
--- a/openbsc/src/input/ipaccess.c
+++ b/openbsc/src/input/ipaccess.c
@@ -57,7 +57,7 @@
 static struct ia_e1_handle *e1h;
 
 
-#define TS1_ALLOC_SIZE	300
+#define TS1_ALLOC_SIZE	900
 
 static const u_int8_t pong[] = { 0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_PONG };
 static const u_int8_t id_ack[] = { 0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_ACK };