The attacker has been released from the Sudanese top flight side following his poor performances since joining the club from Egypt
The decision was taken after a meeting between the team's officials and the player with his agent Islam Al Mallah present.
Otobong joined Al Hilal Omdurman from Egyptian club Ittihad Sakandari for $1.2 million (€961,000), but never managed to live up to the performances required within a team that was competing in the Caf Champions League.
The terms of the player's release sees the striker relinquishing $150,000 (€120,000) that would have been due to him in the two years that were left on his contract with Al Hilal.
The 25-year-old featured in the Cameroon Under-23 side at the All African games, but has never represented the Indomitable Lions at senior level.