ggsn: Use larger MSISDN number

Change-Id: I8a1eeb48efdddaa4f5466cdbe72545523ce31cb8
diff --git a/ggsn_tests/GGSN_Tests.ttcn b/ggsn_tests/GGSN_Tests.ttcn
index 7418638..b67645d 100644
--- a/ggsn_tests/GGSN_Tests.ttcn
+++ b/ggsn_tests/GGSN_Tests.ttcn
@@ -2194,7 +2194,7 @@
 
 		g_gy_validity_time := 3; /* Grant access for 3 seconds, needs to be re-validated afterwards */
 		f_init();
-		var PdpContext ctx := valueof(t_DefinePDP(f_rnd_imsi('26242'H), '1234'O, c_ApnInternet, valueof(t_EuaIPv4Dyn)));
+		var PdpContext ctx := valueof(t_DefinePDP(f_rnd_imsi('26242'H), '1234567890'O, c_ApnInternet, valueof(t_EuaIPv4Dyn)));
 		ctx.pco_req := valueof(ts_PCO_IPv4_DNS_CONT);
 		f_pdp_ctx_act(ctx);