Revert "drop (now) unused code"

This reverts commit 2b30cbdfa83c20045ef92f53e88441dda185591b.

Reason for revert: Older versions of osmo-msc were actually calling map_codec_to_pt().

Change-Id: Ifff31012b327d40ed0b1559d5cf4f320784a4061
Related: https://jenkins.osmocom.org/jenkins/job/Osmocom-build-tags-against-master/1792/console
diff --git a/tests/mgcp_client/mgcp_client_test.ok b/tests/mgcp_client/mgcp_client_test.ok
index b16d1bc..039fbd9 100644
--- a/tests/mgcp_client/mgcp_client_test.ok
+++ b/tests/mgcp_client/mgcp_client_test.ok
@@ -181,6 +181,35 @@
 test_sdp_section_start() test [17]:
 
 test_sdp_section_start() test [18]:
+ 110 => 96
+ 111 => 97
+ 112 => 98
+ 113 => 99
+ 96 <= 110
+ 97 <= 111
+ 98 <= 112
+ 99 <= 113
+
+ 0 => 0
+ 3 => 3
+ 8 => 8
+ 18 => 18
+ 0 <= 0
+ 3 <= 3
+ 8 <= 8
+ 18 <= 18
+
+ 110 => 96
+ 111 => 97
+ 112 => 98
+ 113 => 113
+ 0 => 0
+ 96 <= 110
+ 97 <= 111
+ 98 <= 112
+ 2 <= 2
+ 100 <= 100
+
 ds/e1-1/s-15/su64-0@mgw
 ds/e1-2/s-14/su32-0@mgw
 ds/e1-3/s-13/su32-4@mgw