Added field maximum bitrate to codec param, this is useful for providing safer frame size calculation, especially when peer's bitrate is unknown

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@1985 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjmedia/src/pjmedia-codec/gsm.c b/pjmedia/src/pjmedia-codec/gsm.c
index 555901f..5dc2034 100644
--- a/pjmedia/src/pjmedia-codec/gsm.c
+++ b/pjmedia/src/pjmedia-codec/gsm.c
@@ -264,6 +264,7 @@
     attr->info.clock_rate = 8000;
     attr->info.channel_cnt = 1;
     attr->info.avg_bps = 13200;
+    attr->info.max_bps = 13200;
     attr->info.pcm_bits_per_sample = 16;
     attr->info.frm_ptime = 20;
     attr->info.pt = PJMEDIA_RTP_PT_GSM;